A quiz will show up as an individual assignment in gradebook automatically.
First, set your "master quiz" to "graded" by toggling the option in the upper right-hand corner:
You will then have the option to set points per question OR to bulk apply points per question by adding max points to the field at the top right and "equally dividing by max points" (click "apply points" to bulk apply the points). Be sure to click "Save" to save your changes!
Now, click "schedule quiz" to schedule your quiz - if you have a gradebook enabled in your class Group Space and are scheduling a "graded" quiz, a gradebook entry will automatically be created for you. If you have created categories in your gradebook, you will be prompted to select one.
This will schedule the quiz AND create the gradebook entry in your gradebook.