It would be useful to be able to copy an exiting record and then revise it. When building an inventory and you have multiple coins with similar values, it would make it quicker to add subsequent coins.
The certification number makes "copying" a non-issue - no 2 coins can be the same even if they are the same year/denom/mint mark
Adding a coin(s) is as easy as the Add Inventory link - type the cert - check the box to update all sets
All that is required to add a new coin at any time is the 7 or 8-digit cert number