It is possible for you to create a library of questions in order to both have your questions in a single place and to reuse them in different surveys.
Adding a question to your library :
Adding a question from your library in your survey
Editing your categories in your library
You can also edit your category directly from the "Edit" unit by clicking on the three dots next to your question :
Deleting a question or a category
Deleting a category from your library:
Deleting a question from your library:
Adding or removing a question from a category