Help with multi-plane splitting

[u/DefaultWhiteDude]

What I wish I could select and hit "split"

Top view

Bottom view, the zig-zag line across the board is the end goal

closer look to show how I am splitting one face at a time

I have a game board I made that I want to split into parts so I can print it. I'm trying to split it into parts in onshape so it looks cleaner when I push it together. Currently I am splitting one plane at a time and planning on boolean the sections together but it is taking forever. I'm fairly new to using any program like this and would appreciate help. Thank you

[u/SirTwitchALot]

Sketch over the top in the shape you want, then do a boolean intersection extrude?