For Dismissal Plans to appear for teachers and attendance admins on the "Schools" tab in the LMS Manager the "Enable Dismissal Plans for Teachers" checkbox should be enabled. To get to this setting, navigate to Modules and Settings > Modules > LMS Manager > Schools Tab.
Attendance Admins can use the dismissal plan filter to display students with updated dismissal instructions on the Attendance screen:
The data that is displayed for student dismissals is pulled from each student's Constituent Manager profile:
(This data can be included on student data sheet uploads.)
There are three default dismissal options, but LMS admins can create more in LMS Manager > Attendance tab: