Welding in Catia

I'm having problems with the weld designer in CATIA (V5). There are a few different welds that I'm having problems with. Any help with any one of them would be great!

So firstly, i have problem with welding Profile that cuted with cutback command in structure design. like( miter cut, weld cut, cut to plane, ... ) I've attached a picture of the sample miter cut below. Surely this should be a pretty standard weld but I can' find any help on how to create weld on it.
thank you for helping me