Enter a description for the field.
Select a Field Type. For instance, is your UDF to be a single line of text, or a Date, or a True/False field.
Select the Data Domain that it is to be applied to.
Tick the Data Areas that you want the UDF to be available in.
Set the minimum and maximum allowable values, if applicable.
Make sure the Active box is ticked.
Save your UDF.
You may need to log out of SIMS .net and back in again before your UDF becomes available for use.