If you are a paying member of Project-GC, you can create a Custom Filter for an attribute. Positive and / or negative.
You find the Custom filters In the menu from your username or use http://project-gc.com/User/CustomFilters )
Choose a name and click Add
Select the Attributes tab, find the yes or no attribute you want, select each one and click "Add as required"
Click Add to filter, then Save
Go to Map Compare https://project-gc.com/Tools/MapCompare
From the Add filter dropdown, select Custom filter.
In the Custom filter dropdown, select the filter you just created.