My ordering system is generating invoice numbers which once imported to Quickbooks resets the ongoing invoice number generated by QB. Is it possible to make QB ignore?

Let me help with your question about transaction numbers, userbrothers.

Will you also be using the invoice numbers generated by your ordering system or by QuickBooks? If you have the Customer Transaction Number feature enabled, the system will automatically use the last number used in the most recent invoice. 

For now, there's no option to make QuickBooks ignore the data that's being imported into the system, particularly the invoice numbers. You'll want to reach out to the developer of your ordering system and check if there's a way to synchronize the assigning of numbers to invoices. 

In the meantime, feel free to visit these articles for more guidance and references:

• How to Change the Invoice Number on Sales Forms
• Add Service Fees Manually to Invoices

You can always ask more questions or reply to me in case you still need more help with QuickBooks. We're always here to make sure everything is working fine.