Hello @Hardloper123 Thank you for your post!
Please see the response below for the questions posted in the original post.
- This is by design. You cannot transfer ownership to multiple accounts.
- Not required. But if you've RBAC roles assigned that may get removed and you may have to re-assign them.
- Billing ownership transfer of a subscription will not affect resources within the subscription.
- I strongly recommend reaching out to Azure billing and subscription management team to get 1:1 advise on accomplishing this scenario. Here is the link - https://learn.microsoft.com/en-us/azure/azure-portal/supportability/how-to-create-azure-support-request to create support case.
Note: You will not be charged for Azure billing and subscription management support request.