How do I distinguish paths by group in multiple group models?

By default, umxRAM labels paths using s simple "A_to_B" style.
To distinguish what group a path is in, simply add suffix = to the uxmRAM call. This will add the suffix string to each path. (for one-off differences, just add the label manually inside umxPath).

so

m1 = umxRAM("firstGroup", data=data, suffix = "_group1",
    umxPath(v.m. = c("A", "B")),
    umxPath('A', with = 'B')
)

Would contain paths like "A_with_B_group1"