How to transfer Absence Plan balance to another plan when there is a Assignment Transfer

Summary:

When a employee is transfered from one entity to another that has a different plan, how can we automatically transfer the balance to the new plan without manual entervention?

Content (required):

When a employee is transfered from one entity to another that has a different plan, how can we automatically transfer the balance to the new plan without manual entervention?

Version (include the version you are using, if applicable):

22B

Code Snippet (add any code snippets that support your topic, if applicable):