Master Vellum Box Sets: The Complete Assembly Guide

Box sets sell. Readers who missed your series the first time want to binge the whole thing. Bargain hunters wait for the discounted bundle. BookBub loves featuring complete collections. The math makes sense: three books at $4.99 each becomes a $9.99 box set, but the perceived value screams "deal."

The problem? Combining multiple Vellum files into one cohesive package involves decisions about structure, front matter, back matter, and formatting that aren't obvious until you're staring at a broken table of contents or a KDP upload error.

This guide walks through the complete process. By the end, you'll have a professional box set ready for ebook distribution and print.

How Vellum Handles Box Sets

Vellum uses a structure called Volumes to organize box sets. Each book becomes a Volume, a container that holds all the chapters and elements from that individual book. Think of Volumes as folders. Your box set is the master folder, and each Volume is a subfolder containing one complete novel.

This structure matters because it affects your table of contents, your navigation, and how readers move through your bundle. In an ebook, readers can tap to jump between volumes. In print, each volume starts on a new page with its own title treatment.

The good news: Vellum handles most of the complexity automatically. The decisions you need to make are about what to include, what to remove, and how you want the final product organized.

Before You Start: Prepare Your Source Files

Vellum works best when you feed it Vellum files (.vellum). You can also use Word documents (.docx), but the import process strips some formatting and requires cleanup.

For the smoothest experience, locate the original .vellum files for each book in your series. If you've been formatting in Vellum all along, you already have these. If you only have the exported ebooks (EPUB or MOBI), you cannot import them directly. You'll need to go back to your Word manuscripts and import those instead.

Clean Up Individual Books First

Before combining anything, open each book individually and make sure it's publication-ready. Check that chapter titles are consistent across the series. Verify that your author name matches exactly in each file. Fix any lingering typos or formatting issues.

This step matters because problems multiply in a box set. A minor inconsistency in one book becomes a jarring pattern across three. A name spelled differently in your "About the Author" section looks careless when it appears multiple times in the same product.

Creating the Box Set

Open Vellum and select File ▸ New Box Set. This opens a panel where you'll add your books.

Click the Add button and navigate to your first .vellum file. Select it, then repeat for each additional book. You can also drag files directly into the panel.

The order you add files determines the initial order in your box set. If you add book three before book one, that's how they'll appear. You can reorder later by dragging, but getting it right the first time saves a step.

When all your books are added, review the list. Make sure they're in the correct sequence. Then click Create.

Vellum combines your files and opens the new box set document. You'll see a Navigator on the left showing your volumes as expandable folders. Each volume contains all the chapters and elements from that original book.

Configuring Your Box Set

Title and Author Information

After creation, Vellum shows the Title Info panel. The default title is "My Box Set," which you'll want to change to something like "The Thorne Chronicles: The Complete Series" or "Books 1-3 of the Nightfall Saga."

Your author name should already be populated from the source files. Verify it's correct and consistent.

Cover Images for Each Book

Vellum can include individual cover images at the start of each volume. This visual separation helps readers know when one book ends and the next begins.

In the settings, look for Include Cover for Each Book and toggle it on. Vellum will pull cover images from your original files if they were included there. If not, you can add them manually to each volume.

For ebooks, these interstitial covers create a satisfying visual break. For print, they add pages (and cost), so consider whether you need them.

Table of Contents Decisions

A box set table of contents can list just the volumes (Book One, Book Two, Book Three) or expand to show every chapter within each volume.

For shorter series with reasonable chapter counts, showing all chapters helps readers navigate. For a ten-book series with twenty chapters per book, that table of contents becomes a multi-page monstrosity.

Select the Contents element in your Navigator. In the settings, you'll find List chapters within Volumes. Toggle this off if you want a cleaner, volume-only table of contents. Toggle it on for full chapter listings.

Preview your ebook to see how the table of contents looks in practice. Adjust based on readability.

Multi-Author Box Sets

If your box set combines books from different authors (an anthology or collaborative bundle), Vellum handles this with a specific setting.

When you add files with different author names, the setup window lists each author. Check Include Author for Each Book to display the individual author on each volume's title page.

This setting ensures credit goes to the right person while still allowing the bundle to be sold under a primary author or publisher name.

Managing Front and Back Matter

The messiest part of box set assembly is deciding what front and back matter to keep, what to remove, and what to consolidate.

What to Keep at the Box Set Level

Your box set needs its own front matter: a title page, copyright page, and table of contents. Vellum creates these automatically when you make the box set.

For back matter, you typically want one "About the Author" section at the very end of the box set, not duplicated in each volume. Same for "Also By" lists and mailing list signups.

What to Remove from Individual Volumes

Each original book probably has its own "About the Author," "Also By," and promotional back matter. In a box set, this creates repetition. Readers don't need to see your bio three times.

Go through each volume and delete redundant back matter elements. Keep the chapters and any book-specific elements like acknowledgments or author's notes that differ between books. Remove anything that repeats across all volumes.

Leave one consolidated set of back matter at the box set level, outside any individual volume.

Using Vellum's Reuse Feature

If you've already created perfect back matter in another Vellum file, you don't need to recreate it. Use File ▸ Reuse Elements From to import existing elements from your other books.

This keeps your "Also By" page consistent across all your products. When you release a new book, update the master version and reuse it everywhere.

Generating Your Ebook

Once your box set is assembled, generating the ebook works the same as any Vellum project. Click Generate and select your output formats: Kindle, Apple Books, Nook, Kobo, and Generic EPUB.

Box sets create larger files. This is unavoidable. Three books combined will be roughly three times the file size of one book. If you've included cover images for each volume, the file grows further.

For Kindle, larger file sizes mean higher delivery fees if you're enrolled in the 70% royalty option. Vellum automatically optimizes images to reduce this cost, but be aware that a 10MB box set incurs delivery charges around $1.50 per sale. Factor this into your pricing.

Generating Your Print Edition

Print box sets require more attention than ebooks because physical constraints matter.

Choosing a Trim Size

Your box set will have significantly more pages than any individual book. A 300-page novel times three equals a 900-page doorstop. At that page count, your trim size choice affects both cost and physical practicality.

Vellum offers multiple trim sizes. For box sets, 6 × 9 inches is often the best choice because the larger page size reduces total page count. A book that runs 900 pages at 5.5 × 8.5 might run 700 pages at 6 × 9.

Open File ▸ Print Settings (or press Shift-⌘-P) to access trim options. Vellum shows your total page count in the lower left corner. Watch this number as you experiment with different sizes.

Page Count Thresholds

KDP has page count limits. Standard color books max out at 550 pages. Standard black-and-white books allow up to 828 pages. Premium color allows up to 660 pages.

If your box set exceeds these limits, you have options: increase trim size to reduce pages, split into multiple box sets (Books 1-3 and Books 4-6), or remove elements that aren't essential.

Margin Adjustments for Long Books

Books with higher page counts need larger inside margins (the gutter) to account for the binding. Vellum's default inside margin of 0.875 inches works for most books, but box sets with 500+ pages may trigger KDP upload errors.

If KDP's previewer flags an "insufficient gutter" warning, return to Vellum and increase your inside margin. Check Vellum's print settings for margin options, or consult their help documentation for specific thresholds.

Uploading to KDP and Other Platforms

Kindle Direct Publishing

Upload your Kindle file (.mobi or the newer KPF format) through your KDP dashboard as you would any book. Set your price, select categories, and submit for review.

Common upload issues with box sets include the gutter margin error mentioned above and occasional formatting warnings about drop caps near the spine edge. These are typically cosmetic and won't prevent publication.

If you see an error about bleed settings during print upload, make sure you've selected the correct bleed option in KDP. Vellum's default print output doesn't include bleed. If your cover has artwork extending to the edge, your cover file needs bleed even though your interior doesn't.

Wide Distribution

For Apple Books, Kobo, Nook, and other platforms, upload the appropriate EPUB files from Vellum's output. Each platform has slightly different requirements, but Vellum generates platform-specific files that comply with their specifications.

Consider whether you want your box set on all platforms or Kindle-exclusive through KDP Select. The decision involves the same tradeoffs as single books: wider reach versus promotional benefits and Kindle Unlimited page reads.

Common Mistakes and How to Avoid Them

Forgetting to update "Also By" pages. Your box set itself is now a product. After publication, go back to your individual books and add the box set to their "Also By" sections. Cross-promotion works both ways.

Inconsistent chapter numbering. Some authors number chapters continuously across the entire box set (Chapter 1 through Chapter 60). Others restart numbering for each volume (Book One: Chapter 1, Book Two: Chapter 1). Neither is wrong, but be consistent. Vellum's chapter numbering settings let you choose your approach.

Keeping redundant front matter. Each original book has a copyright page, dedication, and other front matter. In a box set, you probably want one combined copyright page at the beginning, not three separate ones. Review each volume and remove what shouldn't repeat.

Ignoring file size for ebooks. Large box sets can approach or exceed 20MB. This affects delivery costs on KDP and download times for readers. Compress images where possible. Avoid decorative images that don't add value.

Not previewing the final product. Before uploading anywhere, open your generated ebook in Kindle Previewer or Apple Books. Tap through the table of contents. Check that volume breaks appear correctly. Verify that no back matter from individual books sneaked through.

When to Release Your Box Set

Timing matters for box set success. Common strategies include:

After series completion. Wait until your series is finished, then release the box set. This lets readers who waited for all books to binge the complete collection.

Staggered release. Release a box set of books 1-3 while continuing the series. This creates a new entry point for readers who discover you mid-series.

Promotional timing. Box sets perform well during sales events and BookBub features. Having your box set ready to discount during a promotion can drive significant volume.

The box set won't compete with your individual books as much as you might fear. Different readers buy different formats. Some want individual books at full price as they release. Others wait for the bundle. You're serving both audiences, not cannibalizing one.

Your Next Steps

Gather your .vellum files. Open each one and verify consistency. Then create your box set, configure your table of contents, clean up redundant elements, and generate your outputs.

Test everything before uploading. Preview the ebook navigation. Check the print file's page count. Verify that your metadata is correct across all platforms.

Box sets take more setup time than single books, but the work is straightforward once you understand how Volumes function. Your readers want the bundle. Give it to them.