To Delete an Automatic UDF Definition
1. Click > 
Definition operations 
Delete AutoUDF definition.
Definition operations Delete AutoUDF definition.2. The Delete AutoUDF Definition dialog box opens, and the AutoUDF coordinate system box is active. In the model, select a coordinate system where you already defined an Automatic UDF.
3. To delete all Automatic UDFs created by this definition, select Delete UDFs for this definition.
4. Click one of the following buttons:
◦ Repeat to permanently delete this Automatic UDF definition, and then delete another Automatic UDF definition.
◦ OK to permanently delete this Automatic UDF definition.
◦ Cancel to cancel this delete process and close the dialog box.