You can take the class packages offline and they will only be available for sale in the Register.
To take a Series or Contract offline
Log into your zingfit account
Navigate to Admin >Scheduling/Retail > Series/Contract > locate the package in question
Select the 'X' location on the same line as the series or contract
This will remove the option from being sold online (if you are using the zingfit buy pages)
If I take a recurring billing contract "offline" will it still auto-bill?
Yes, it will.