Hello,
First of all the inventory for #1-1 is created as Inventory Id (not SFC), thus you will not be able to start/complete them or do other operation that can be done with SFCs, you will be only able to assemble them in CT500 POD plugin or in As-built configuration (one by one or all at once is controlled by qty field in assembly gui). You can create 1 id for entire 150 qty, or 150 IDs qty=1 each. Or in any other combination depending on Qty Restriction field in Material Maint.
#1-5: Serialization is only for SFCs, you can't serialize Inventory IDs.
I believe scenario #2 is not valid at all as you cannot process assembled SFCs/Inventory Ids. Or am I missing something?
Regards,
Konstantin