Sloped/tapered wall

[dmi3]

I am pretty new to Revit (working with it for about 2 weeks now). Now I was making a sloped wall (which is apperently not an option with the wall menu/properties).
The thing I tried now is to make a mass and place a wall by face.
But the problem now is that i can't attach the interior and exterior walls to the sloped wall and can't attach the sloped wall to the exterior wall below it.
I have searched the forum, but it wasn't clear for me how to do it.
Hopefully you can help me with solving my problem
I have added my file as attachement

[roy.70844]

Welcome to Revit.
try using the edit profile command. When you select the wall you need to edit, select the edit profile button, just to the left of the attach button on the options bar.
This will allow you to medit the shape of the wall and draw the sloping edge to match your sloping wall.

Roy

[dmi3]

It wasnt the hard part yet for me. Now I want to make the east side of mass higher as the westside. Making a sloped top and keeping the south sloped side. I couldn't figure it out. The mass that I have now is attached.