Configuring Unbounded Picklists
A bounded picklist is a type of list that allows the user to choose a value from the values that this list displays. An unbounded picklist is a type of list that provides the same functionality as a bounded picklist, but it also allows the user to enter a value in the field associated with this list. if the user enters a new value in an unbounded picklist, then Siebel CRM Desktop can do one of the following:
Save this new value in the field but not add it to the values that the picklist displays.
Save this new value in the field and add it to the values that the picklist displays.