s of the moment, many of the keyboard commands you might use in other programs won't work the same way in QuickBooks. If you have backup data, you can restore the backup. Otherwise, you will have to redo the items over again.
This should be used as a suggestion to allow multi step undos.
I did not make a backup just because I wanted to add several items. Backup/restore is not the issue here. I had added 10 items, decided to delete them, then rethought about and wanted to add them back. Multiple undos would have been the option I was looking for.