What I needed?

I created a many2many field (x_group) in the employee form(hr.employee) the relation I have given for many2many field in a custom model (x_egroup) for creating the email group names (just the names no need to send any mails)

once I select the group in the employee form, the employee name should automatically be visible in the email group form (x_egroup)

how to make this happen ? any idea ? 

I am using odoo 11...