The only means of managing an offline member locally is via the CLI. Most of the CLI commands are member/ appliance specific and can be used to change the settings/ configurations locally. For example, you can use the below command to transfer the zone data from the primary server whether offline or online. 

* set dns transfer zone [dns_view]

And, the below one to delete an A record

Plese note that not all the functionalities, protocol specific configurations are manageable via the CLI commands. Here is a snippet from the admin guide about a few additional CLI commands for  your reference.

For more details, you may go through the Admin guide / CLI reference guide. It is always recommended to first test any changes in a lab setup that may have any impact in the production