Very basic question on Fusion 360

[Neale]

Under the 2D operations drop-down menu, I would use "Contour" for that. I'm assuming that you have already created a "setup" which defines the work coordinates? For something like this I would set Z=0 to the bottom of the work. Then when you create your cutting operation, select the bottom contours of your tiles and set the bottom cutting height to, say, -0.2mm, depending on how flat your spoil board is. You can also specify tabs to hold the pieces in place while cutting.

To be honest, a reply like this could ramble on for pages specifying a whole raft of things to set but one of the key bits of F360 is knowing which settings you can ignore and leave as the default!