An input of -1 cannot be used in the Intuit Tax Advisor program to zero out a calculated field like you can in the Lacerte program. 

When you want to adjust an amount out that you cannot find an offsetting input field it is recommended that you access the Pre-strategy baseline screen, Other Income section and enter a positive or negative offsetting amount in the Taxpayer and/or Spouse Other Income Subject and/or Not Subject to SE tax field.  

An input here will allow the overall adjustment.