Scenario: Students in class 11C choose between two elective subjects: Informatics (with teacher Anna Lee) or Music (with teacher Robert Davis). The two lessons must not create gaps for students — grouping them in the same division ensures this.

Step 1 — Create the division

Go to Classes → 11C → Subgroups → Add division.

Field	Value
Division name	Optional
Subgroups	opt1, opt2

Save.

Step 2 — Add the lessons

Go to Lessons → Quick Add:

Teacher	Subject	Groups	Lessons/week
Anna Lee	Informatics	11C-opt1	1
Robert Davis	Music	11C-opt2	1

Both lessons belong to the Optional division, so the scheduler knows they can run in parallel and will try to avoid leaving either subgroup with a gap.

Result in the timetable

Students who chose Informatics attend opt1 while Music students attend opt2. The scheduler keeps their slots aligned so neither group ends up with a free period in the middle of the day.

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