So I’m trying to upload a circuit board that has multiple breakaway parts since they’ll always be used together. There a fab since it gives me an automated preview of my board. However, the internal cut out slots aren’t showing up as cut out. 
How can I guarantee that the dark purple spaces will be cut out? someone say to put “CUT OUT” in the routing spaces but I’m not sure what layer to put these on, I can’t put it on the edge cuts layer. 
I made the board in kicad but it’s not really specific to kicad since I can’t seem to find any posts that agree on how I should label the cut outs.

There are 4 individual boards to this one board.

You can see the yellow edge cuts here and what the board is supposed to look like.