In assemblies we have a very useful Pattern based on Pattern. Unfortunately, there is no analogous operation in the part (multi-object).

I'll show you today, how can you get something close in part.

Having a welded structure, I insert a screw into it through Insert part.

The control operation will be here Hole Wizard. As you know, the wizard is based on sketch points, in which it creates an instance of a hole. So I will use these points.

I choose Sketch-based pattern and I indicate the points from the wizard, and I indicate the screw in the graphics window as the object to be duplicated. Ready.