This option automatically assigns a work order number when creating a new work order. When you enable this setting, the work order number field will show the label "Automatically Assigned" and, on saving, it will generate a number. You can customize the number sequence on the Number Series screen.
To enable this feature:
Click on the gear icon and select Settings.
Click on Asset > Auto Work Order Numbers.
Check the Auto Work Order Numbers checkbox to enable this setting.
Click on the Save button.
A link - Setting Up the Automatic Work Order Number will appear on saving.
The link will navigate to the Number Series screen where you can customize the number sequences for auto-generation.