I am drafting 2 peices of aluminum track based on profiles provided by my manufactuerer. My boss wants me to show these two peices coming together as if they were cut at a 45 degree angle so they would fit together on a 90 degree corner. I cannot seem to make the trim or fillet commands cut through the extruded element, nor is there an option to make an extrusion with an angle in the program. please advise how I can cut the 45 on a 3d extrusion after it has been extruded.

thanks!