You can combine manual and autograding for a Jupyter assignment as below - 

First go to the Grading section of the part and add rubrics for manual grading -

Follow the steps to create cells for auto-grading.  For the Jupyter Release step, please make sure to unselect  the flag "Delete unused grading items"

Now, you can follow the manual grading process to give scores for the rubrics that are manually graded.

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