I transferred 5 times during my 9 years with the company. Its very simple if done correctly. But it can also be very easily mishandled.
All you have to do is to talk to your ETL-HR, and request a transfer to another store. Everything else is conducted by HR.
If your HR is smart and proactive, they will send an email to the new store of your years of service, work areas, notice of no current corrective actions, availablity, starting date and your STL/area ETL approval for the transfer...The new store will respond back by accepting or denying the transfer and on what areas have openings. After confirming all that info, its just the matter of contacting the new store's HR about setting up your first schedule. At some point, your old store HR will have to release you from their scheduling system so the new store can add you to their system.
If you are being put on probation upon transferring, then that store is being run quite differently and very strict. You are only on probation for your first 90 days with the company.