hi was wondering how to cut ramps into a flange i drew in autocad. the ramps need to be the three outer wings of the circle. its a lid for a twist lock flange made of acrylic. when you twist it down the ramps put pressure on an oring and make a water tight seal. im pretty green at acad still. ive extruded it out to the size it needs to be - .25" but cant figure out how to ramp it. i'll attach the dxf so you can see it and a picture of what i am trying to accomplish.