No, there is no way to merge royalties from multiple accounts into one account.

However, if you are a publisher managing royalties for authors, you can set up an "Organization" account on Leanpub, and add the authors and their books to your Organization account. That way, you would manage the royalties.

Here is a page about Organization accounts:

https://leanpub.com/organizations

Here is where you can sign up for an Organization account:

https://leanpub.com/p/register

Here is a brief article about Organization accounts and royalties:

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