Select Settings within the course you want to copy INTO:
Select the button Import content into this course:
In the dropdown, select Copy a Canvas Course:
You may need to select the course in the drop-down.
Select the All content radial button:
You may want to only import certain items, such as only quizzes. Below is how that works.
Do steps 1 through 4.
On step 5, you will select Select specific content
Then, click import (it may say updating…).
You will click select content. A window will pop up and you can click all the boxes next to the item you want to import.