thanks Rod, that explained it pretty well. I would not have thought to go about it that way.
It's good to know that this basic methodology works; I was able to get the elevation of the beam to print out along its length. Some subtleties are still not worked out, though, like it printing 104.00" instead of 8'-8" (it would be better if we used metric, sigh) , and it would be nice if one could also add some editable inline text with it, as is possible with dimension strings. So I could call out the material~ 4x8 DF#2 @8'-8". Are there any ways in the normal user interface to do this, or is it a situation where I would need to do some coding? (which I am not yet up to).