If you're lookin to completely delete your inventory, including all items in QuickBooks, it's a bit more involved than just clicking a button. First, let’s make sure this is really what ya want cuz once gone, it can't be recovered. If you're sure, you'll need to inactivate each item. Unfortunately, there's no built-in feature to mass delete items in QuickBooks, so it's gotta be done one by one, which can be pretty tedious.

Here's how you do it: Go to your Lists menu and choose item list. Right-click on each item you wanna remove and select Delete Item. If QuickBooks says an item is used in transactions and can't be deleted, instead choose Make Item Inactive.

But here’s the thing. In large inventories, this manual process can be a pain (been there!). To speed things up, try using QuickBooks' Excel import/export option. Export your item list, mark them for deletion, and re-import it. You can also explore third-party apps that might automate parts of this, integrating directly with QuickBooks for bulk editing tasks.

Always back up your company file before making these kinds of changes. Wouldn't want to lose more data than intended. If you’re feelin overwhelmed, it might help to get a consultant who can guide you through the process or even set up some automation tools to stop future headaches.