It took me a second to understand what ron045 was saying, but this is how I understand him:
Cut a 4' x 8' sheet to be 3' x 8', leaving one 1' x 8'.
Cut a second 4' x 8' sheet to be 3 x 8 foot, leaving one 1' x 8'.
Cut a third 4' x 8' sheet to 2' x 8', giving two 2' x 8' pieces.
Take a 1' x 8' and lay along side a 2' x 8' making it a 3' x 8'. Do this twice.
The result will be four 3' x 8' sections made from three 4' x 8' sheets.
Reducing any waste
