When creating a rubric there is an option at the top to explore the Rubric Library.
Click the blue "Rubric Library" button to open up the library (circled in green below). This will include all public rubrics, your personal rubrics from previous assignments and institutional rubrics (if your school has an institutional plan).
Search through the correct library to find the rubric you are looking for and then click "Copy Rubric Questions" at the bottom. All the rubric questions will be copied into your assignment!