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Level 4

A dropdown list only shows single lines.But you can use a textfield for multiline.

For Custom Text Entry you can check the "Allow custom text Enter" checkbox on the Field tab, you can type a default selection that is not one of the  list items.

 

Note: This option is available only when the Type option is set to User Entered - Optional, User Entered - Recommended, User Entered - Required, or Read Only.