I'm new to SW and I'm trying to make a fairly simple design. A rectangle of one material with a square of another material in its center. I'm then going to use the Add-in to pull on one side and show the strain across the assembly. I have all of this figured out except how to get the center square to stay put in the hole I've made for it. I tried mating but I feel like that just places one part into the other instead of truly bonding them. If I do this in one part instead of an assembly, I can't get the two sections to extrude different heights. The center needs to be 0.050mm higher than the rest of the part. I've attached a photo and the assembly. If I haven't explained this well, please let me know!