Mates can be added only to end fittings (flanges or fittings) in a route sub-assembly. If you delete the mates on an end fitting, or if you insert an end fitting at the end of a 3D sketch segment, the position of the end fitting becomes driven by the 3D sketch.
- If you want the end fitting position to drive the 3D sketch instead, right-click the end fitting and select Constrain Sketch to Fitting.
- To restore the fitting to driven status, right-click the end fitting and select Constrain Fitting to Sketch.
The position of all other components in a route subassembly is always driven by the 3D sketch.