How to Copy Security Class access from one HFM app to another

I want to assign Security for one of the EPMA HFM application.I have granted all HFM Security groups access/roles to that application.Now I need to assign rights for those HFM groups to access Security Classes(Read,All,None,etc).I would prefer copying the same security(Group Vs Security Class Rights) of another EPMA HFM application in the same environment.

1. Earlier when I grant Security groups ,access to an application and then when I check Security Class Vs Group rights, it would have already inherited the same rights of other existing applications.But I am not sure what change has happened it doesn't inherit .I have to manually assign Security Class Vs Group rights.Is there any way to fix it.