Vectric Customer

I want to cut a 1/4" rabbit along one edge of a 10x12 piece of plywood. So I need to know how to put a off set to 1 0f the 10" ends of the plywood so to create a inset for the plywood back. I was able to make the dado for the bottom by creating a rectangle and putting it where I wanted it and then pocketing it out. but the rabbit needs to be in 1/4" from the edge so that it is flush with the outer side.
So an help would be great
Jeff

A rabbet, please, no bunnies, or rebate as the English call them as in the attached image and DXF file?

I did a pocket toolpath using 1/4" dia. bit on the thin red rectangle, in the DXF file, 1/4" deep.