Hi there, @navin1.
We know that having this feature will greatly save your time. However, the option to convert an estimate into sale orders isn't available in QuickBooks Online. Also, the ability to track sales orders is only available in QuickBooks Desktop.
In addition, I've added a link to our Firm of the Future site. This is where we share recent happenings and future developments, such as updates to newly added features.
The Community always has your back, so please let me know if you have other questions.