This feature allow you retrieve a question from a library. Depending on where you come from to this screen, you will either insert a new question or replace an existing question in the current question.
Select question library from the list. You will be forwarded to a screen where you can select questions that you want to copy. If you want to copy multiple questions, click on the "Select link" to mark the desired questions. Click on the "Copy selected" button to perform the copy to survey operation. If you want to copy only one question, click on the "Copy this" link and the question will be copied immediately, and the window is closed.