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This is done at the school level. Also, assumes that the staff member is in PowerSchool (if not, you'll need to create the person in PS).
Navigate to the school.
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School Management > Courses and Programs > Course Sections
Click on the course that you want to create a new section for.
Fill in the information.
Period information (listing of periods if they are weird)
At MPC
Attendance AM = AAM
Attendance PM = AAM
Preschool For All = PFA
Preschool IDEA = PI
Preschool Local District Funding = PLD
Tuition Based Funding = TB
K4s:
Attendance = ATT
If a teacher is starting mid year, then after you save the section, edit the "Teacher Course Assignment Tracking Records" which will be uploaded to ISBE.