I have created a layout sketch but I cannot get my parts that I want to the layout to control to mate to it. I know this is a basic operation but I cant seem to get it to work.

This is what I have done:
1.) Created a sketch in an assembly
2.) Created a part outside the assembly
3.) Inserted the part inside the assembly with the sketch

I can get the parts to mate to the assembly drawing but it does not follow the sketch when i change the dimensions of the sketch.