Is there a way to restrict the ability to remove line items from a Sales Order based on the fact that they have already been billed? i.e. I want my sales associates to be able to add or remove lines from a Sales Order at any time, but in the specific event that a certain line has been billed (an invoice with that line associated with the Sales Order exists), they should no longer be able to edit or delete the line.

No.

Thank you!