On Windows PC 

To edit the list of category values, choose Category Values from ListPro's Tools menu. From here you can add new category values. You can also delete a category value won't change that value in any items already using it. Those items will continue to display the delete value. It isn't possible to rename a category value at this time.

On iPhone or iPod touch

To add or delete category values on your iOS device: 

1. Open the list you want to edit the Category Values for
2. Tap the List button in the Control Bar to open the List group
3. Tap the Category Values button in the List group