Causes QuickBooks to warn you when you try to record an estimate that has the
same number as a previous estimate.
The warning causes QuickBooks to take more time to record an estimate. This
affects performance significantly if you have a large company file.
Where to find this preference.
To do this task
Go to the Edit menu and click Preferences.
In the Preferences window, click Jobs & Estimates in the list on the left.
Click the Company Preferences tab.