Pocket with tapered floor

I’m needing to draw a pocket with a tapered floor in a part and I I don’t know how to do it, can someone help me out please.

Do you mean that it should Taper from the sides into the middle or do you want it to just angle from one side to the other ??
Have you tried the “Loft” strategy ?

The sides of the pocket have to be straight, the floor of the pocket has to taper from one side to another.

Why not make a ‘plug’ and do a boolean subtract? There maybe other/better ways but that should work.