Complex recess in a part

[zayd]

Hello,

I have the general design of my part complete, however, there is an important detail I am having trouble with. In the attached design, you'll see a 1.25"-wide recess that runs the length of the piece. When viewed from the front, you see that this recess has vertical walls. How can I adjust this so that the walls are at a 45-degree angle away from the top? The front view does not allow me to change any of these lines.

Thanks for the help.

Zayd

[Tech2]

Please see:
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[zayd]

Great... thanks!