How can I subtract a body from a tapered body?

I created this body using the approach this user suggested. Now I’m trying to subtract/extrude the section highlighted below but the body is tapered.

Which tool can I use to achieve this?

Please show us, upload, screenshot or video…

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yes my bad, added picture

Can we assume the extrusion you wish to subtract also has a tapered edge or feature? All we can see is a highlighted surface.

One way is to simply re-create the original tapered body minus the area you now wish to subtract.

In this picture, you have the “offset face” tool selected. Did you select the “Extrude” tool?