You can dimension from your reference plane to the spot elevation points in an elevation view. Then attach a notation in the plan view and click and drag the appropriate dimension into the text box of the notation. That way it will be parametric. Then either put the dimension in a layer that is turned off or if you don't want the plan view at all you can drag it off the sheet so it won't show when you print. I know this is far from a perfect solution but it's the best I can come up with.
On top of what Glen said take a look at the datum targets in the
annotation toolbar. You can also change the different arrow point
symbols as well.
Any chance you can post an image of what you are looking for?
I knew there was an approach something like that that should work. I will try that if I can't figure out something more elegant.
I have looked, with ignorant eyes, at datums for as long as I have had SW. (2008) Everything I know about CAD I learned from using the software. There are many holes in my drafting education. The attached PDF is an example of a plan from a few years ago. The pink symbols are the spot elevations I am refering too. They do not have leaders indicating the precise spot like I would prefer but the concrete foreman and I would discus any that he was unclear about.
Double-12 Dairy-Floor Slopes.pdf 121.9 KB
(per Glenn's method somewhat) you can also link a note to a dimension value by clicking on the dimension while editing the note then hide the dimensions layer. Updating the dimension in the model will update the note.
I'm only saying this because I'm not sure about your current method... a simple example of your current setup might help in providing options.