Hello there, @MikeGT.

When you choose to remove transactions before a specific date, you're removing old, closed transactions from their current, working version of the QuickBooks company file. Then, it creates a summary monthly journal entries for the old, closed transactions and places these summary transactions in the current, working version of the QuickBooks data file.

By doing this, your client's inventory count remain as is. 

Get back to us here if you have other questions or concerns. I'm always here to help.