I remember a few years ago watching a video where in an assembly, the user pulled or extended the length of a part. When that occurred, more parts would auto-populate parts into the assembly (e.g. pipe length is 100 inches long and has 2 supports [at equal lengths], I go and change the length to 200 inches and the system auto adds 2 more supports to total 4 supports over the pipe). Does anyone know how to do that? I just remember it wasn't anything with configurations.

Thanks,