Click "Administration".
Click on the "Shop" tile.
Click on "Settings".
Enter the desired "Invoice Start Number" and "Estimate Start Number".
Estimates/RO's and Invoice numbers are produced on separate sequences. Estimate and Repair Orders will always share the same ticket number, and Invoices will produce a different number. Both the initial Estimate/RO number, as well as the Invoice number will always be associated with the ticket.
Click "Save" to finish.