Accounting entries from FA subledger is not flowing from Primary ledger to the secondary ledger

Summary:

We have a corporate book associated to a primary ledger(PL), for this corporate book, we don't have tax book associated with it. The accounting entries are flowing from FA subledger to the Primary ledger but not to the secondary ledger (SL). I understand that we can enable the flow by unchecking the valuation method in the Manage Subledger Accounting Options. But, I have few questions regarding this approach.

1. If we enable the flow of accounting entries by unchecking the valuation method, will it be possible to disable the flow and create the Tax book associated with the secondary ledger in the future.