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  I've tried to import the legal guardians into the base, but I can't associate several guardians with the same student.

In the import window, make sure you have selected the correct data type Students and their guardians (and not just Guardians).



To associate the rubrics of guardian 2, click at the top of the column and then click on Add Guardian - you can create as many additional guardians as you need.



New rubrics are created, specific to guardian 2.