In order to Cut the wall after an angle I usualy use one of the two methods described in the following:
Draw a second wall at the desired angle and then override with Hide Elements -image 1
Make a Component >Model in Place >Wall >Extruded Void and Cut the wall with it. If you attach the edge (as seen in the second image) to the reference plane -then moving the reference plane - moves the cut...image 2 and 3
The first method is a quick one , but it has to be repeated in every View because is an override by View....