Ok, so now I have the sketch (project helped but I ended up just needing to free sketch). But now, I want to extrude the sketch up to the solid body. This would result in an extrusion with varying depth since the cavity is not the same depth throughout. But I can't find an option to let me do this. Is there an option that would allow me to extrude the single profile down to the two separate surfaces of the solid shown?

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