Help w/ massing shapes

[PaperStreet SoapCO]

This isn't very important, but I was wondering how I can get the top of a massing object to slope. I don't have much experience with the massing objects in revit - so I tried doing a blend but that seemed like a headache. I could just make the roof out of the top and then slope that but I kind of wanted to get a hold of the massing tools.

I'm pretty sure there is an easy solution here, I'm just missing it.

I attached an image to try to make things clearer - the masses gradually get taller but I would like the roof to slope upwards so that the rise seems continuous.

Thanks!

[Brian Myers]

Have you tried using a Void object? It can create this slope for you depending on what you want.