Hello there - I hope you can help. I am fast losing my hair on this one!

I have a data sheet in Excel 2000 that I cannot alter or sort. As per my
example below it contains numerous rows that contain a list of customers.
Under each customer it contains product by product data that is then sorted
by column into monthly sales and then totals. My problem is that I need a
LOOKUP formula that is able to say "Lookup row with Customer A, THEN LOOKUP
the next row that contains 'product B', THEN find the column in that row that
gives TOTAL".

Ambitous maybe. I have bought 3 Excel books that do not give the solution so
I hope it is something that comes with experience not books! Each customer
has the same list of products so I am struggling to locate a multiple formula
that finds the NEXT "product A" after a particular customer.

Example data

AXIS / col a / col b / colc / col d / col z

row 1 / customer a / blank / blank / blank / col z
row 2 / product a / blank / blank / blank / col z
row 3 / blank / blank / blank / blank / col z
row 4 / blank / blank / jan / feb / col z
row 5 / blank / sales / 100 / 200 / TOTAL

row 23 / customer g / blank / blank / blank / col z
row 24 / product a / blank / blank / blank / col z
row 25 / blank / blank / blank / blank / col z
row 26 / blank / blank / jan / feb / col z
row 27 / blank / sales / 200 / 300 / TOTAL

Summary: Is there a formula I can use that ignores the empty cells and can
locate on a data sheet a particular customer name in column A, then the next
particular product also in column A, then a particular attribute (sales or
revenue) which is in column B, then return from that row the value in column
Z (TOTAL).

Thank you in advance for your help on this problem. I have seen how much
advice has been given on the other topics and think this community is
fantastic.
--
Matthew Cardiff