How to remove a wedge of material?

Hello,

I am trying to make a wall mount bracket and am working on the female part. I am trying to make something similar to the image attached, but with some changes. The current part I am struggling with is making the wedge space for my mount to rest on. I have side wedges to slide on, but wanted the superior wedge for more support. How can I remove that material?

il_1588xN.5993267807_ngxp.jpg

Here is a picture of my document so far.

image.png

And here is a link: https://cad.onshape.com/documents/0939e97424f9a2af7d56ee65/w/8ac6052280aebc9ff56101d2/e/e174fe47eae5662442d99101?renderMode=0&uiState=677c9f2b775510738e882509

I am an amateur and just getting into this as a hobby, so I still have a lot to learn. Thank you for your help!

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