What defines what you need and don’t need? Are you using the inventory tracking feature via recipes? If you have a long list and you want to delete out what you don’t need it might be easiest to use data export and modify your list in Excel. If you don’t have a systematic way of deciding this then you’ll always be modifying your report.
Filtering
https://kb.sambapos.com/en/9-1-9-custom-report-filtering-and-grouping/
Data Export
You could always go low tech and just line out your items with a marker 