Freezing Data

Hello, Is there a method within Anaplan to freeze a version i.e stop it from being rules calculated, whilst retaining the data?  For example in a module I have two versions - Fcst 1 and Fcst 2.  The same rules apply to Fcst 1 as they do Fcst 2.  However, at a future point I would like to freeze the data on Fcst 1 whilst Fcst 2 calulates as normal. Thanks A