Corner round feature reference

Adds fillets or rounds to one or more corners of a sheet metal part. You can create fillets or rounds of different sizes in a single operation. All fillets and rounds created in a single operation are one feature.

Access

Ribbon: Sheet Metal tab Modify panel Corner Round

Corner	Defines a set of sheet metal corners for fillets or rounds. Click to add a new set.
Radius	Specifies the radius for a selected set of corners. Click to change a radius, and then enter a new value.
Select Mode	Changes the method for adding or removing corners from a corner set. Corner selects or removes single corners. Feature selects or removes all corners of a feature, except the corners that result from intersections between the feature and other sheet metal faces.