Ok, I think I may have partially figured this out.
I went into the Estimate Table and created a new Field called SalesTaxGroup and chose drop down as the field type. I then chose "Choose from existing table from the drop down wizard". I then chose Itemsalestaxgroup as the existing table to choose from. Step 3, then only choice I had was recordID, so I chose that.
Now when I goto the estimate customization sreen my new field is available. So, I dragged it onto the estimate screen.
When I did a test estimate, I had drop down choices, however, they were 4 digit numbers rather than the descriptions I had set up in Quickbooks. Example : Arlington Tax Group in Quickbooks showed up as 1158 in my drop down list in the Method Estimate screen. It looks like the calculations are correct, but the descriptions did not get brought over.
Can you help me figure out how to get the decriptions over from Quickbooks?