I've search for a week now and can't seem to find an answer.

I have a spreadsheet that contains about 150 columns with row 1 being an
account number and rows 2..n contain products purchased. Example:
10 20
apples cans
oranges boxes
grapes

Some clients may have only 1 product while another client may have 300.

How can I transpose the data into rows and maintain the account number with
the item? Example:
10 apples
10 oranges
10 grapes
20 cans
20 boxes

Any help would be appreciated.

Thanks,
Allan