We had created a set of secondary ledgers last year to hold data from all sub ledgers and 606 revenu

We had created a set of secondary ledgers last year to hold data from all sub ledgers and 606 revenue numbers.

The SL were created but never reported upon as the plan to go live with 606 got pushed out.

So these only have non-revenue sub ledger entries from last ~6months.

Now the plan is to go live with 606 in PL at the end of FY19.

But we want to do Dual Reporting (both 605 & 606).

Business wants to check if instead of disabling the old SL, can we delete their transactions and use them from FY20 onwards.

My q here is, IS that even possible? My understanding is we should disable the old SL and create new ones.