You apply a custom sort order to a custom field when you want to control the order in which a custom field's values are listed:
By default, custom field values are listed alphabetically. While alphabetical order often makes sense, in some situations a custom sort order makes it quicker for editors to add events and easier for visitors to scan category lists.
For example, a local radio station website might create a venue types field that includes categories such as churches, museums, and libraries, as well as an "Other" catch-all category.
The Other category is essential but also the least likely category to be assigned to events or of interest to site visitors. By using a custom sort order to place Other at the bottom of the venue types list, the station can speed up the event creation process and make it easier for site visitors to filter events by the type of venue they prefer.
You can apply a custom sort order to any list of choices custom field.
Note: If you have an existing field that was created before December 18, 2008 you will need to convert the field to the new enhanced list of choices field in order to apply a custom sort order.
Or, if your account was created before 10/5/2010, click Create a new field.
Tip You need to set custom sort order only for the values that will not display alphabetically. For example, suppose you have an Age Ranges list that includes Adults, Children, Seniors, and Teens and you want an age-based sort order. Edit only the Adults and Seniors fields by giving them custom sort order values of 3 and 4 respectively. Or, suppose you want a specific value, such as Other, to appear at the bottom of a list. Edit only that value and assign it a custom sort order number that is at least as high as the total number of values the field contains.