Hello
Thank you for your question and reaching out. I can understand you are having query\issues related to RDS cals.
Yes , It is supported to split RDS CALs, then migrate part of RDS CALs to another RD Licensing server.
If you wish to split existing RDS CAL, one pack, half on one server and half on another server, you can rebuild current RD Licensing database, then, re-install RDS CALs on both licensing server, with appropriate CALs number entered.
Reference:
[ https://learn.microsoft.com/en-us/answers/questions/295916/migrate-a-few-rds-cals-to-another-server-(-split-r]( https://learn.microsoft.com/en-us/answers/questions/295916/migrate-a-few-rds-cals-to-another-server-(-split-r)
--If the reply is helpful, please Upvote and Accept as answer--