If you want to edit bus or tram relations PTv2 in easy way try this service: https://relatify.monicz.dev
There are some disadvantages:
- You have to create missing relation in other software (JOSM, iD) - relatify can only edit existing relations. Try to add to new relation at least first and last highways and platforms.
- Missing platforms you have to add in other software too.
- Try to wait few minutes between editing another or the same relation in relatify - new data have to propagate to server - 4 minutes between edits is rather enough.
If you respect limitation above, than you probably will have fun with PT relations updating!