Slice Angled Surface Through Vertical Boss

Hope my subject explains this, I don’t find it very easy to explain, but how do I go about slicing through A with surface B ?

I have tried using the move tool to drag the top point down to the B (as per the red arrow) however that creates a strange compunt angle and does not slice a flat surface though the boss ??

You can tap crtl to pushpull through a curve.

Another option if you prefer.

@Box - thanks (again) option 2 was easier for me and worked :slight_smile: