With SOLIDWORKS Routing, you can create a special type of subassembly that builds a path of pipes or tubes between components.

A route subassembly is always a component of a top-level assembly. When you insert certain components into an assembly, a route subassembly is created automatically.
You model the route by creating a 3D sketch of the centerline of the route path. The software generates the pipe or tube along the centerline.