Sloped Ceiling?

[m_cahoon14336]

I am trying to put a gyp. bd. ceiling on a slope, but I can't figure out how. In section it will not rotate.
I'm sure this is very simple, but I'm missing it. Can anyone help me with this?

[aaronrumple]

I am trying to put a gyp. bd. ceiling on a slope, but I can't figure out how. In section it will not rotate.
I'm sure this is very simple, but I'm missing it. Can anyone help me with this?
Add in slope arrows while sketching - just like the roof tool.

[m_cahoon14336]

Thanks, Aaron