Hi Jova,
The way in which to get the same number invoices as what it was before is to physically type the number in, go to invoice on the right hand side their will be a small box with invoice number above you type the right number in their you need it to be, once you save it and open new invoice it will go to the next number in the sequence for you.
In regards to the gap you will just have to keep an eye on it and when the 750 have been used up, you will need to manually adjust the invoice number to the end of the sequence your at with your newest invoice you have put into QuickBooks.
We can offer any compensation for the work you need to do, but we can help you with any queries you have about this.
Ashleigh
