Can I make my Fence Legend Smart?

I have a fence legend where I have rock and soil showing, as well as different groundwater level symbols.  I would like some parts of the legend to disappear if not applicable to the fence.  For example, if just one boring has a <<TABLE.Field>> populated but none of the rest of the borings do, if I try to use an output condition of <<HasData(<<TABLE.Field>>)>> it does not show in the legend.  I don't think it is searching through all the borings.

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