currently we are using a regular AD account for this. We want to change this group managed service account. What is the process for changing the directory service account to a group managed service account? Do i need to reinstall the agents ?
No need to reinstall the agents. Just create the gMSA in the domain, grant the computer accounts the permissions to retrieve its password, grant the gMSA the 'Logon as a service' privilege on the servers, and add the gMSA in the portal.