How would you handle this in NS? Subsidiary A buys serialized inventory from a third party vendor. It does not know and care about the serial numbers. Subsidiary A sells the inventory to Subsidiary B. Subsidiary B unpacks the packaged inventory and track the serial numbers.

If it's Serialized from the Vendor, why wouldn't Sub A know the Serial #? Do they choose not to b/c as you said they don't care as it doesn't mean anything to them? Does Sub A buy/sell this item? or does it only sell it to Sub B?

Sub A doesn't need to know the serial numbers. Sub A only sells it to the other subsidiaries (not externally).

so if they dont need to know, and dont care, why not just set it up so you have a standard process. that way if the process ever changes in Sub A, its already there. I personally would just implement that change so when they receive the order, they need to fill out the Inventory Detail. this will be alot easier than trying to figure out a customization and implementing that

They need to physically unpack the packages to see the actual serial numbers which they're unwilling to do. The vendors send us a list of the serial numbers which is not always accurate. When received in Sub B, we are forced to use the serial numbers from the interco IF and then do an inventory adjustment to remove the incorrect serial number and key in the correct one.