How do I specify TA grading permissions in the Gradebook2 tool?
If your site has users in the Teaching Assistant (TA) role assigned to sections, you can override default TA grading permissions, so TAs can grade any or all sections. If your gradebook has been set up for categories, you can also specify TA grading permissions for categories.
Choose the desired grading permissions from the drop-down menus. For example, to allow the TA to grade everything, select can Grade, All Categories, in All Sections.