I want to add 'if' condition in the email template and if it returns true insert a particular

merger filed.

I have all the users stored in a custom object with a custom field to differentiate them by designation.

I have a workflow rule in place (working fine) to send an email whenever a new record is created.

I want to include the name of the user for particular designation with 'hello',  if not just 'hello'

Is it doable in first place..any suggestions are appreciated.

Thanks.