I think we've all seen situations where we need to include a reference dimension to some known surface or feature that happens not to be within the scope of the view we're delaing with. For example, you want to indicate the height of some object off the floor.

You would add the dimension, and on the dimension line to the referenced feature you would add a second arrowhead to indicate that the dimension is not connected to the referenced feature. I've also seen this method used to indicate diameters when only radii are shown. Its such a common thing that I was surprised to see that the SW pop-up menu for arrowhead selection does not include that option.

Does anyone here know what I'm talking about? And is there a way to create such an element? (To me, this is like a foreshortened dimension but different.)