Yes, you can upgrade or downgrade your subscription right from your CameraManager dashboard. If you upgrade (total cost per month are higher), your new plan will be directly available. The start date of your trail will be changed into the date of upgrading. If you downgrade (total cost per month are lower), your new plan will become available at the start of the next billing period.
Please contact your reseller or CameraManager support if you want to change your subscription.