Lets describe it with an example,
I have two box as 2 different body, coinsided with each other. Now I want to create a pin and groove connection between them. I started with one coinsided face of one box and draw a sketch and extrude it. It will intersect the other body right? How about there will be a modeling technique, when that will be activated, I extrude the pin and similarly the other box will have a hole. (May be with a clearance control also)
It would be good to create connection.
Thanks.