How to make the top of a wall angle? For example a wall only being as high as a stair railing.

[S-A-L]

I saw an earlier post to create a temporary roof slope and then trim the wall to the roof.  But when you erase the roof having used it as a cutting tool, then the wall goes back as though never cut.

[Dave Seabury]

S-A-L  

You have the right idea with the SEO.  Simply create a layer called "SEO" for the cutting

form (roof), and when you are done turn that layer off to hide the form you used, the wall will remain cut.

David

[Ignacio Azpiazu]

These days the Opening tool placed on the wall is a much prettier method for that type of subtraction from walls than the traditional invisible-SEO-layer roof&trim/SEO (the wall opening can have any shape, and extend beyond the wall itself) wherever you don't need the roof itself. The opening is attached to the wall, moves along with it, and can be modified individually; and you can use that one opening to cut both sides of the stair, if you need sloping walls on both sides.

If you have some sort of top-of-wall finish, like a board, or a coping on an exterior wall, or some sloped top profile for drainage, etc., then the prettiest method of them all is the sloped beam (which in most cases can stay positive and visible, instead of going negative into the SEO operator invisible layer) doing the subtraction with upwards extrusion; the beam can be a complex profile, allowing for cross-slopes, drip edges, etc.

[Laszlo Nagy]

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@Ignacio Azpiazu wrote:

If you have some sort of top-of-wall finish, like a board, or a coping on an exterior wall, or some sloped top profile for drainage, etc., then the prettiest method of them all is the sloped beam (which in most cases can stay positive and visible, instead of going negative into the SEO operator invisible layer) doing the subtraction with upwards extrusion; the beam can be a complex profile, allowing for cross-slopes, drip edges, etc.

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Or you can use a Railing composed of a single Top Railing; it can be associated to the Wall so it moves along with it, and the Top Railing profile can cut/trim the top of the Wall if needed.