TAD Setup In Case of Global Procurement

Summary

TAD Setup In Case of Global Procurement

Content

Hi Team - Below is my scenario:

Requisition BU - Canada BU
Ledger - Canada Ledger
COA - Canada COA (Having 5 segments)

Sold to BU/Sold to LE - US BU
Ledger - US Ledger
COA - US COA (Having 7 Segments)

For Global procurement, the destination Charge/Variance account derives based on the Requisition BU (Canada BU) and PO Charge/Accrual/Variance derives based on Sold to BU (US BU).

Now in the task "Manage Subledger Accounting Options" we assign a TAD based on the ledger.
So in my case, I have two different ledgers with two different COA structures involved. so how can I define my TAD?