You can create an environment variable on the instance type and set it to export so that all instances in an application blueprint that utilize the instance type will have access to it.
Thanks @sjabro . Could you please provide some more details? how to create an dynamic environment variable from Morpheus? I am able to see we can able to create environment variables manually in the advanced sections. For me that needs to be in dynamic value ex; once instance gets provisioned need to execute some command that command output, I need to pass it as a variable to other instance.