How can I copy division from one class to another classes

In case you need to join groups from multiple classes into one joined lessons, we recommend you to use the same names of the groups. For this purpose, it is very convenient to use "Copy to" feature in "Define divisions" dialog.
It will allow you to create division just in one class, and then copy it into another classes as you need. It saves you a lot of work and ensures exactly names of groups in divisions.