make a tween switch?

[AlanPS]

If you have 2 switch layers with interpolation on, say front view at frame 1
and side view at frame 12, how do you copy frame 6 and make it a new switch layer for a 3/4 view?
I've done it, but by "mistake"- I never remember how to do it, so I keep trying but not getting it.

[mkelley]

Duping the vector layer and then going to your tween frame, selecting all the verts and adding a key for changes -- copy this key back to frame 0 and you then have a new switch.