I agree that custom button codes can be created, but for the original posted example (see the PDF above), both BEND types (a quarter bend and a short sweep) would not survive a ‘Fill in 3D’ after an ‘Erase 3D Item(s)’.  In order to have both BENDs used on the same Design Line, the user must manually place one of the BENDs.

If the user needs to place fittings manually, then the Design Line ‘Fill in 3D’ and ‘Erase 3D Item(s)’ commands become potentially costly pitfalls.  How can users place the first fitting (a short sweep) and then exclude it from the second BEND location (the short sweep still satisfies that second node’s criteria)?

The situation presented was for a single size for all pipe and fittings.  Both bends have similar size ranges so we are not interested in excluding the use of a BEND based on size alone.