I am making a valve that has multiple pipe sizes that connect to it. The valve body stays the same while the hole/port size changes to 5 different sizes. What is the best way to create the parts for these multiple sizes? And the best way to create the Assemblies? Currently I am using one part that has configurations for each size, and I am using configurations all the way up through the assemblies. I am running into trouble when I have custom valves where more then the hole size changes, the assemblies seem to die and also get confusing? I am having trouble managing all of this stuff in my current set up. Any suggestions are welcome.