Yes, as an administrator, after filling in all the required information on the ‘Create new classes’ page, you can leave the ‘Teacher’ field blank. Once a teacher is assigned to the class, you can add them to it, following the steps of our Help Centre's article: How do I add teachers to a class?
If you need additional information on how to create your class, you may visit: How do I create classes as an admin on Cambridge One?
The attached file goes over the details of this process.