Yes! As long as your ticket is not invoiced, you can always change to personal (see exception for Circle K Business Card below). You can also change back if you wish. You do this via My Pages where you can find your receipts or subscriptions, depending on the type of ticket you have. A new invoice is created on the 16th of every month, so you must have made the changes you want before then.

Circle K Business Card as a payment method
No! If you have started your ticket for At work and have not had the opportunity to change it by ending it when starting, it is not possible to change the cost center afterwards. If you have started a ticket as Personal that should have been At work, it is not possible to change the cost center during ongoing or completed parking. If the cost is allocated to the wrong cost center, we advise you to contact your employer for internal handling.