On the ribbon, click Home tab Project panel Project Manager Project Setup.
In the Project Setup tree view, expand General Settings. Click File Name Format.
On the File Name Format pane, do the following to specify entry fields on the New DWG dialog box:
Under Name, enter a name. This name appears as the label for an entry box in the New DWG dialog box.
Under Type, click the drop-down list to select a type. For example: select String, Numeric, or NominalDiameter.
Note: You can also specify a newly-created property with a selection list of values (for example: if you add the property Pump_Manufacturers and create a selection list of specific pump manufacturers, you can specify the new property under Type).
Under Length, click the drop-down list to select a number from 1 to 9. This number determines the required number of characters to be entered into the box.
Under Delimiter, enter a character (for example: a dash or comma).
Click Add as many times as required for your format.