There's a whole list of symbols that you can add to *any* dimension. Do your (aligned) dimension, then select that dimension and look at the options availble in the Feature Manager area. There's 3 text boxes there, and a bunch of symbols below the lowest text box. One text box is for the line above your dimension, the middle text box is where the dimension appears, and the bottom text box is for the lines below the dimension. I think when you insert one of the symbols (click the symbol), they automatically appear/default in the lowest text box, but you can copy/paste the symbol text to any of those other boxes, and anywhere in that box (before, after, above, below, or wherever from your dimension text). Also, you can even paste that symbol into a separate annotation note comment.
Ken