Crystal Reports Puzzle

I have a Crystal Report that is reading a table for sales invoices where there may be for example 50 of a product sold (1st row for transaction in table) then 50 rows with the serial numbers of each.
I print the sale line and then report the serial numbers, but unfortunately each one is a separate line, creating multiple pages.
QUESTION how can I get the serial numbers to print across the page with line wrapping?
Have tried lots of tricks to no avail so need some inspiration, HELP!!!!!!