In SF we have some really long bus lines, 6 miles long and a ton of stops. One of those lines has a part-time extension now - it runs to an underserved overground rail station. It’s a very high-value extension but runs only on weekdays, not weekends.

Normally we have separate relations for the weekday route and the weekend route. But others built those routes. I help maintain the ones we have, but I can’t think of any way to get iD to clone a relation.

Is anyone either in SF and wants to clone the 31-Balboa, or knows of a tool that can do this? I’ve looked at JOSM and simply couldn’t figure it out. I’m happy to do the grunt work of extending the line; I just have no good starting point.