These methods only work with the FMS or with Universal approved emulators. If you’re trying to do this in flight sim or some other program, the functionality will not be the same - or will be reduced.
The manual leg change (#3) only works when you are direct to the waypoint you want to go FROM. So, if you’re trying to do this on the ground for a waypoint that is still down the line, it won’t work. It won’t work in flight either if you’re not already to that first waypoint.
As for RNAV SIDs or Vector SIDs that are loaded, you’ll notice a NO LINK is programmed at the end of the SID. This indicates the FMS does not know how to link the SID to the enroute network. With these SIDs, you’ll typically read “for vectors” somewhere on the chart. That is, ATC will provide radar vectors to intercept the flight planned track or will send you direct a waypoint on your flight plan.
For example, leaving CYYZ on the BOMET SID. You’d load it to get some of the turns to display immediately off the runway, but then ATC would have to send you direct to one of the waypoints further along for you to fly the balance of the SID profile. This may, or may not be immediate and may result in multiple vectors before being sent on your way.
The same principle applies when connecting to the enroute network.