Customizing Potentials

Customizing Potentials

We are going to start using the Potentials area of ZohoCRM to capture information.  One of the default/mandatory fields is "Potential Name".  Instead of having this as a free-form field I would like to change this field to be a picklist with preset values.  Is there any way this can be done?
 
Ideally we want to run reports based on certain types of product we are selling.  I realize I can create a customized field to capture this information but would like to use the existing field if possible.