Hi Dale,
Don't use Tables that much but we do use a method to add symbols to dimensions by adding an aligned note to the dimension and this works well even if it is a kludge.
But the thing that allows it to work is sort of hidden and relates to our drawing templates. When I made these latest ones I called up a format as usual but I added the new symbols we wanted to use off the edge of the drawing template then deleted them and saved the template. This saves the symbols locally inside the template and means no path is required for them. Now if a user wants to use those symbols they are in the symbol palette and they can be called in when text editing a note. I think it is this last functionality that you will want.
Hope this helps.
Regards, Brent