Hi tygaf
Open Josm
File => Download from Osm...
goto Tab Slippy map
Browse the slippy map to Munich
I downloaded a small region around Petersplatz
File=>New Layer this is Data Layer 2
In the Layer panel on the right Select Data Layer 1 (again) make it visible by clicking on the little eye on the left side of it and activate Data Layer 1 by clicking the layer icon at the bottom of this panel
In the relations panel on the right side scroll down to find all the relations you want and please note that some are incomplete (outside the area you downloaded) For your purpose you must first make the relations you want complete. There are two ways to get them complete. 1) via the relation itself, 2) Via it's parent relation.
Example for 1) :
select route("Bus 132:Forstenrieder Park => Marienplatz", 196 members, incomplete)
Call the relation editor for selected relation by clicking on the icon at the bottom of the relation panel
In the Edit relation #3,657,886 in layer 'Data Layer1' panel goto the Tags and Members Tab.
In the Refers to column you see a lot of incomplete members
Look carefully at the far left side. There is an icon of a harddisk with a little green arrow on top of it. Click on it to download the incomplete members.
Continue with Example for 2)
In the the Edit relation #3,657,886 in layer 'Data Layer1' panel goto the parent Relations Tab
There is the parent relation : route_master("Bus132",2members)
Select this parent relation
Click Edit at the bottom of this panel
A new relation editor panel will now open : Edit relation #3,657,914 in 'Data Layer1'
goto the Child Relations Tab to see the two child relations of which only one is still incomplete, but there might be a lot more which you could then to all in one go
Click dowload All Children at the bottom of that panel. Now both children are complete : Bus 132 Forstenrieder Park => Marienplatz and Bus 132 Marienplatz => Forstenrieder Park
Close both Relation Editor Panels
In the Reelations Panel on the right select both relations (Hold <Cntrl> or <Shift> in the usual way to select more than 1 item) It is of course possible to select all relations you want. Which is only usefull if they are all complete (downloaded)
On the bottom of the relations panel click the icon with the sharp arrow : set the current selection to the list of selected relations
In the main window these will now be purple
On the Toolbar Edit=>Copy
In the layer panel on the right :
Select Data Layer 2
Make this layer the active Layer by clicking on the layer icon at the bottom of the layer panel
Make this layer visible by clicking on the little eye on it's left side
Make Data Layer 1 unvisible by clicking on the little eye on it's left side
On the Tool Bar Edit=>Paste
You should see now a black background with only the two bus relations in purple (because they are still selected) If you click some where in the black background the get their color back.
If you zoom and select you will see the details of the bus relation. Like the name of the streets this bus takes but also the surface=asphalt in the Drygalski-Allee
On the Tool Bar : File=>Save as and choose the name and type of the file
hth
Gys