need a way to add existing contacts to account

need a way to add existing contacts to account

There doesn't appear to be a way to add existing contact info to account contacts requiring us to re enter and duplicating information.

Quick use case of why this is an important feature:
make a contact with X not knowing 'value'
realize later contact X is found to be working in or with or for Account Y
Zoho CRM doesn't provide functionality to connect Contact X with Account Y...

Please in near future version provide this functionality.
Dennis Daniels