SOS I accidentally uploaded 100s of duplicate sales orders and they werent detected as duplicates, how do I delete in mass? The inline editing feature is not working well

A number of ways. If you can identify the duplicates in a saved search you could write a workflow to set each line to a zero quantity/amount. If you want to fully delete them, you’ll need a bit of scripting. I have a Mass Update script to delete records.

what's wrong with in line edit? should allow you to delete 200 at a time with no scripting. Search needs to be main line = True and you need to show some editable body field (i usually use some custom field).

Do you have ARM enabled that creates Revenue Arrangements (and maybe Revenue Recognition Plans) from the SO?