Mass Delete lines from Task "Manage Units of Measure Usages"

Summary:

Hello,

Is there any way to mass delete lines in the Task Screen "Manage Units of Measure Usages" without doing it manually line by line?

We have hundreds of lines with no Subinventory that we want to delete. I tried exporting the Excel file, deleting the items with no subinventory and re-importing the file, but the items with no Subinventory are still there (see first screenshot). The second option is to export the Excel spreadsheet, populate the subinventory (because that's what we want to do) and re-import the file, but then it creates duplicates of the item (one with the subinventory and the original one with no subinventory) see second screenshot.