I made a quick little tool in ModelBuilder to add specific fields based on a precondition (checked boxes). The issue I'm having is that if any of those fields already exist in the feature I'm trying to add fields too, the tool won't run. Sometimes some of the fields already exist in a feature, and I'm wanting to just add the missing ones. I could delete the existing fields, but then I would lose the data in those fields.
I've found info on a If-Field-Exists logical tool, but I can't seem to find it within Model Builder.
Is this a tool found only in ArcGIS Pro?