Variable legend referencing a library table

Hello

I have 6 symbol boxes I would like to populate on a legend with rock type symbols specific to my project (variable legend entity). The problem is that my project rock description table fields for different borings do not directly lookup from the material graphics symbols, so I don't know what to enter into the "Field with Data" box of the variable legend entity.. 

Some info about my template:

  • Field with rock types for my boring:  <<STRATIGRAPHY.Rock_Name>> - with required lookup from the Libtbl!rock type
  • Library table (Rock Type) has these fields:  Name, MatlSymbol, and Description
  • MatlSymbol in the library table has the names of the symbols I have defined in the Material tab of Symbol design (USGS types)
  • For example BASALT in library table calls USGS 717 from the Material symbol library

Because the rock description table field I have set to look up from a library table, I don't think the variable legend function will work for me, or will it.

If it won't work, how can I code my template so I can make six boxes on my key, pick the six most common rock types that are entered into the table.

Still experimenting - will delete this if I get it to work.

Thanks.

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