I have a design wall (reverse plastic tablecloth) and once Ive figured out the dupinal setting, i pin a label on each piece. For example
1-1, 1-2, 1-3
2-1, 2-2, 2-3
3-1, 3-2, 3-3 etc...
Then i take them off as I go, but I leave the first one on until I start sewing rows.