How to customize SLA for Non Recoverable tax line to get Project Number from associated Exp Line

Summary:

We have POET information on each Payables Invoice Line. When we calculate tax, the Tax Line account goes to a generic account.

We have a Project Number as one of the segments in our COA.

My client wants to have Project Number segment populated from the associated Expense Line to the Tax Line account combination.

Is this possible? Has anyone done this? If so, what source do I pick when creating a new Account Rule.

Content (please ensure you mask any confidential information):

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

We are on 24A (11.13.24.01.0)

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