Hi @Geb140, I'll surely help change the type of your items.
You can export and import the list of items to change them from service types to inventory items. I'll show you how.
- Go to Lists.
- Select Item List.
- On the Excel menu, select Export All Items.
- Click Export.
You may need to mark all existing items as inactive to make sure your file won't create duplicates. Changes to your items will also affect only to future transaction recordings.
From here, remove certain columns on the Excel file and save them per item type to import service items easily as inventory items. Use this article to learn more: Import and Export Data in QuickBooks Desktop.
I'm adding this reference for tips and guides to utilize in preparation for the coming year-end: Complete Certain Tasks in QuickBooks Desktop Payroll to Prepare for the New Fiscal or Calendar Year.
Don't hesitate to post a reply below if you have other questions or concerns about updating your item list. I'm always around happy to help. Take care and stay safe!