Sloped Slab/Roof to Reference Plane

[brethomp]

Is there a way to get a slab or roof object to slope aligned to a sloped reference plane?

[david.metcalf]

While in plan draw a reference line through the building and select it to give it a name. Use roof by extrusion and use pick a plane option. Pick the best elevation option that comes up and you will be swtiched to that view. If you have a top of Plate level set that as the working level. Now use a combination of reference lines to lay out your slopes. Then use lines to lay out the basis of the extrusion of the roof. Only one line is necessary to extrude the roof. After drawing the lines set roof properties from the side menu not the properties button and then complete the roof extrusion. Then switch to 3D view. Note that teh roof isn't complete until you have extended and cleaned up the geometry with the other roof plans. Use grips, join unjoin and attach top tools to complete the roof.