To move one teacher:

1. In the Teachers tab, click the teacher
2. Click the pencil icon button
3. In the Edit Teacher dialog, click the Change School menu
4. Select the school the teacher will be moved to
5. If you want the teacher's students to be moved as well, check the Move Students box
6. Click Apply
7. Click Save

To move multiple teachers:

1. In the Teachers tab, hold down the Control/Command key or the Shift key as you click to select multiple teachers
2. Click the pencil icon button
3. In the Move Teachers dialog, click the Change School menu
4. Select the school the teachers will be moved to
5. If you want the teacher's students to be moved as well, check the Move Students box
6. Click Apply
7. Click Save