In your database management tool, probably phpMyAdmin type in the SQL box:
Invoice Number: ALTER TABLE invoices AUTO_INCREMENT = 1234;
Pcid Number: ALTER TABLE pc_owner AUTO_INCREMENT = 1234;
Receipt Number: ALTER TABLE receipts AUTO_INCREMENT = 1234;
PC Work Order Number: ALTER TABLE pc_wo AUTO_INCREMENT = 1234;
Where 1234 is the number you want to start with.
Posted in: Installation FAQ