You can not do it manually without overrides.  Personally I like overrides to do it correct.  Proseries requires you to enter on 1099-K worksheet and in reconciliation portion there is box to check which will subtract off the gross received amount to $0.  Reporting $0 from sale of personal loss items is what you want.

This puts sale price and sales cost on same line 8z of Schedule 1.  I think the IRS is seeking the cost of item on line 24z, which is same result except sale amount shows in full as income on line 8z.  Override and put on 24z so you may avoid an IRS letter concerning non reporting.