Boundary-Surface Tool is used to create this feature. From the Selection Manager Box ‘Select Group’ is used to select curves to create the feature.
‘Select Group’ is not selecting curves in my sketch. How to fix it?
SolidWorks Tutorial #268 : advanced screwdriver bit (PZ2) - YouTube
Time 12.21-13.26
Maha,
"Curve1" is hiding the edge of your surface, if you RMC on it & hide it you will be able to select the two edges of the surface for the group.