When there are two or more layers in a staff, I know I can extract parts associated to one particular layer. But what if during composition process you simply want to explode a two layered staff, putting each layer on a staff below (both as layer 1 or 2 as prompted)? I usually use Copy/Move Layers tool but I need three steps to get what I want: 

1-Copy the whole passage to another staff.

2-Move layer 1 to layer 2 on original staff.

3-Select both staves and move layers 2 to 1.

Is there a way to use FinaleScript for this?

Thank you.