Larry,
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Here are some issues to comment on:
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(1)? Your original schematic (3Phase_Voltage_Sense_circuit.asc) leaves the Neutral net floating.? Why?? Did you really want it to float like that?? Also, do you want it grounded in the final schematic?? If nothing else, it is different.
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(2)? The symbol you created (3Phase_Voltage_Sense.asy) is set up with incorrect properties.? It should have Symbol Type = Cell, but you left it with Symbol Type = Block, which is correct only for calling a lower-level schematic, not a netlist file.? Fortunately LTspice seems to handle it anyway in spite of the wrong property.
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(3)? Your final schematic (3Phase_Voltage_Sense_Test.asc) should not have ".inc 3Phase_Vsense.sub" because the symbol file already includes that netlist file.? It does not actually hurt because the end result is that the subcircuit file is included twice.? But it's not a good idea to do that because it might later create problems.
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I think none of these issues causes the problem you have, but I want to mention them anyway.
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Andy
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