Boris, there are two possibilities, neither of which quite accomplishes what
you want, but here they are:
1-You can pull in the external data, then use Excel Subtotal feature to
total your data by groups; or
2-You can use the external data to create a pivot table, which will allow
you to group the data and show totals. There's a good overview of pivot
tables at http://www.peltiertech.com/Excel/Pivots/pivottables.htm.
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