You cannot create questions for CodePair when you are logged in to a CodePair interview session. However, you can access all your questions from the HackerRank library. So, all the questions created by you, your team, or HackerRank are available for your use in CodePair.
CodePair uses the same questions available in tests. So, you can add questions to your personal library in your HackerRank for Work account that you want to use in CodePair.
Refer the Create a new question topic to learn more about creating questions for HackerRank for Work account.