Arias

Some of our tutor groups have 2 different tutors who share the group. We have marksheets set up for target setting, where tutors add comments after meeting with the students. Does anybody know if it is possible for both tutors to access and edit the same marksheet? I can only see how to assign it to 1 tutor. Both are listed on SIMS as joint tutor. I don't want to set them up as supervisor via course manager as they only need to see their own group, not all of them.