Populating Mass Transaction Manager tables with large number of asset IDs

We are using FSCM 9.2 and want to retire a large number of assets using Mass Transaction Manager.  I have used the Mass Changes process in the past for this purpose.  To streamline the Mass Changes setup, I used SQL insert statements to populate mass change tables with asset IDs, department IDs, etc. and would like to do the same with Mass Transaction Manager.  I am having trouble identifying which Mass Transaction Manager table(s) to populate with asset IDs.  Selecting individual asset IDs from the lookup on the Run Mass Transactions page is too time consuming due to the number