reverse fillet?

Hello,

I'm experimenting with sw and I've hit a bit of a wall: I'm trying to put a .03125 reverse or inverted fillet(?) on a model. Specifically on the base of a cylindrical island. I've done some internet research and I've seen mention of a "reverse face normal" option? I haven't been able to find it.

I've attached a snapshot of the model, can anyone help?

SolidworksDrawings And Detailing