I'm pretty sure this can be done with sumproduct, but I can't quite get my
head around it.

I have two tables, Tbl1 A & B, Tbl2 E & F. Both are limited to 15 rows.

A B C E F
1 100 $100.00 100 $300
2 110 $50.00 130 $200
3 100 $25.00 120
4 $75.00
5 120 $120.00

The entries in col E of tbl2 are unique. What I'd like to do given this data
is:

- Sum tbl2 col F,
- for each row in Tbl1, if item A is "" or isn't in tbl2 then add B value to
the sum.
- for each row in tbl1, if item A is found in tbl2 but F is "" then add B
value.

Given the data shown the sum would become:
sum = (F1 + F2) + B2 + B4 + B5 = $300.00 + $200.00 + $50.00 + $75.00 + $120.00

Thanks a bunch,
John