Hi there, @Asil00 and @Ahlcllc.

Thank you for joining this thread and providing details about your estimate number concern. Allow me to loop in and share some more insights.

As mentioned by my colleague, QuickBooks has a sticky setting feature where it will remember the previous information and continue to increment just like the estimate number.

To change the estimate number, you'll have to edit the Estimate # field. In case you enter 100 as the transaction number and save it, the next estimate you will create will have 101 automatically.

When editing the transaction's number, be sure to save it before closing. This is for the correct number to reflect once you email them to your customer.

Keep me posted if there's anything else you need about estimates. I'm still here to help you further. Have a good one.