From your course navbar, click the Tools tab and select Quizzes from the dropdown.

From the quizzes page, click on the Question Library tab.

From the Questions Library page, click on gray Import button and select Browse Existing Questions from the dropdown options.

On the "Browse Existing Questions" page, use the Source dropdown to locate and select the desired quiz. The quiz questions will appear, allowing you to choose specific questions or select all. After making your selections, click the blue Import button.

The questions are now imported into the library. If you’re fine with the questions being added individually, the process is complete. However, if you’d like to organize the questions into a folder, follow the steps in the article below:
Setting Up a Section in the D2L Question Library