Setting Up Agile Planner → Configuration → Attributes Setup → Lists
Attributes can be configured to have drop-down lists and the values contained in those lists are configurable.
Add a new attribute list. Once added, it will be available to choose from the List drop-down in the List Attributes section of the Attributes tab.
You can remove any attribute list that is not being used by an existing attribute. An attribute list's values will be removed when the attribute list is removed.
Make your changes and then save them. Once created, you cannot modify an attribute list's list type.