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Cut Frame Ends at 90 deg Instead of Angles

I am using the Frame feature to make a cut list of steel c-channels. The channels will all be separate parts not connected. I've drawn all the lines for the frame to follow in a top view sketch and I want to limit the frame ends to the surfaces shown. This gives angled cuts parallel to the surfaces.
Instead, I want perpendicular cuts (imagine chopping all this with a chop saw set to 0°) that won't interfere with the surfaces. The red line drawn shows what I want. Basically extrudes but with a profile sketch not in place. What is the best way to achieve this?
I have a cut list now from the Frames. I thought about making a simple extrude with the profile and using the cut list to quickly make 100 different configurations with the lengths. But mating those in place in the assembly seems cumbersome.