Draw a board outline, and then select the 'board outline' tool again. It will warn that the outline already exists and ask if you want to generate a cutout. Proceed to draw the shape defining your slot/cutout.
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Draw a board outline, and then select the 'board outline' tool again. It will warn that the outline already exists and ask if you want to generate a cutout. Proceed to draw the shape defining your slot/cutout.