To Modify an Automatic UDF Definition
1. Click > 
Definition operations > 
Modify AutoUDF definition.
Definition operations > Modify AutoUDF definition.2. In the model, select a coordinate system where you already defined an Automatic UDF. The AutoUDF Definition dialog box opens.
3. In the Variable dimensions box, type values, or select model dimensions and parameters. The Variable dimensions box displays all named dimensions, and real and integer parameters in the model the coordinate system belongs to. If you select a dimension or parameter instead of typing a value, the value of that dimension or parameter is used as the value.
4. Optionally, allow larger or smaller tolerance between the coordinate system and the attach part by entering a value in the Attach part tolerance box.
5. To update all UDFs in touching parts after completing this definition, select Update UDFs in all attach models.
6. Click one of the following buttons:
◦ Preview to see a preview of the UDF modified by this definition.
◦ OK to apply this Automatic UDF definition on the coordinate system.
◦ Cancel to cancel this definition and close the dialog box.