Here's a long article on doing bundles, mostly intended for brand new Leanpub users:

The short version is, go here:

On that page, you can create a new bundle. Then, you can add books to it, using each book's URL, and set a royalty split. When the primary author of the other book accepts the bundle invitation, the bundle will be published. They will get an email with the invitation, as well as seeing the invitation here:

If you have any questions or thoughts on writing and self-publishing with Leanpub, please join our global community of authors in our Authors Forum here!

Interested in creating your first Leanpub book? Here are some quick tutorials for our most popular writing modes:

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