Revit 2011 Creates Elevations

Selecting the Elevation function on the View tab creates elevations. You’ll also notice that as you place an elevation tag, they automatically orient to walls

If there’s no host element nearby to reference, they’ll automatically orient to the west.

Selecting the center of the tag will allow you to create additional elevation (more typically done for interior elevations) by selecting the unchecked boxes that surround the elevation tag

 If you select the nose of the elevation tag, you’ll see a blue line that defines the beginning of the cut plane for the elevation as well as a dashed line that defines the side and rear extents.

 This allows you to control the analytic extents of the elevation without moving the
graphic tag, which is useful if you want the tag in a particular location but you want the actual
elevation to start apart from the tag’s location.

Finally, there are three types of elevations in Revit: exterior, interior, and framing. Their differences are more than graphic. Exterior elevations by default don’t have an active crop boundary,
only a starting cut plane. Interior elevations have their crop boundary on by default and attempt
to find boundaries of host elements, like walls, floors, and ceilings. Framing elevations become
active in the presence of grids, and their cut plane corresponds to their grid.