Scenario: Students in class 11C choose between two electives: Informatics or Music. Putting them in a division keeps everyone's schedule aligned — no gaps for either group.

Step 1: Create the division

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

Field	Value
Division name	Optional
Subgroups	opt1, opt2

Click Save.

Step 2: Add the lessons

Go to Lessons → Quick Add and enter:

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

Because both lessons are in the Optional division, we'll schedule them at the same time.

How it looks on the timetable

Informatics students are in opt1 while Music students are in opt2 — all at the same period, so neither group has a free slot.

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