For example, if in my game I need multiple characters, and for each one I have an extra sprite which not correlates with any PB movement (using char sprite repeat and that), I will need this.
I tried to do it with variables but looks like variables are a little buggy due to the changes.
Anyways, to use it I imagine you could use a command like
design sprite repeat = <id of the movement in that current design>
Works like the char sprite repeat but ids work for the movements of the design
