I have 2 methods for creating bevelled ends on walls.
I'd welcome any comments, feedback and further suggestions.
The first method which is useful for shapes other than a straight bevel is to create a wall component family in place as an extrusion solid. But it's height cannot be tied to a level.
Then someone told me about a method which I thought was very interesting. You create a very skinny wall (in my case 5mm thick) and draw it across the end of the major wall at the required angle. The major wall will then join to it at an angle. You can then use the split tool to remove any extra lenghts of the skinny wall.