Hi @Jully
The PowerSchool Community is a great resource if you have any changes to be made while completing fields within the enrollment form.
Each district, however, has a different registration process and can provide the best steps to move forward when enrolling students. Some districts provide direct links to enroll for a different school whereas some provide the option to submit application using the same form.
I recommend contacting your student's school directly to request the instructions to enroll your student for a second school. You can check out the FAQs related to the enrollment process here.