The attached file shows what I am trying to do.

I first drew this in CorelDrawX3. Exported as DXF.

Then I opened it in BobCad-Cam21. Showed up fine.

Then I did a Solid/SurfaceCreation/PlanerSurface. Looks like it worked.

Then I did a Solid/SurfaceCreation/ExtrudeSurface.
Distance=2 inch ,use normal of object, with cap
That worked also.

Then I selected all and did a Solid/SurfaceCreation/Fillet
Fillet Type = Constant Radius Radius=0.5
This did nothing. But my object shows as a solid?

So I tried not selecting anything and did a Solid/SurfaceCreation/Fillet
Fillet Type = Constant Radius Radius=0.5
This let me select an edge. My problem with this method is I have so many edge parts to this one edge that I can not select them all without messing up.

Is there a trick or secret to this. I tried using help and found out its missing??? If it aint one thing, its another.

Attached is a file showing results of each step.