ROTATE WORKPLANE

Revit has a system similar to the UCS system in AutoCAD. This can be used to draw at angles other than across or up and down.

Whenever you draw something in Revit you do it on a Workplane.

You can make the current workplane visible from Home tab > Work Plane panel > Show command.

You can select the workplane after showing it.

Note the spacing parameter in the modify bar. Revit will preferentially snap to workplane grids, but otherwise you can ignore grid spacing.

You rotate a workplane by using the Rotate command.

Rotate it by using the mouse, or type the angle in.

Now when you draw things will follow the workplane:

Including Components (families):

But note that annotation will NOT follow the workplane:

If you need annotation to also be rotated rotate the view's Crop Box instead.

Refer to: TIPS & TRICKS > SHEET VIEWS and TITLE BLOCKS > ROTATE VIEWS

Workplanes are view based, so you can set up two views of the same level with different workplane rotations (and grid spacing).

ELEVATIONS & SECTIONS

Elevations and sections also have a workplane, but because it is not so obvious where that worklane might be (unlike a floor plan which defaults to its Level), Revit asks you to define where that workplane is.

Unless you have a named Reference Plane, picking the surface of an existing object is easiest:

Select the face that represents the workplane you want to draw in, it will then display:

You can now change the grid spacing and rotate it: