Ignoring axis beyond requested x,y,z

[meerkat (Knoware)]

Here is the seat I want. However to make it work I have to go way outside of what I actually want to cut. So I need to somehow define the zone I want to cut in.

Chair Seat bottom

This is the first time I’ve ever used a CNC design tool. So I’m asking for advice on how to make a sitting pad in a chair bottom. Maybe someone already has it done. Anyway I’m sure there is something better than what I came up with. Thank you for your help… Dan [a] [a1]

Thanks for the help…