Views:
If you are looking to add an existing Client Contact and associate them with a new or different Client, you must first change the Client Contact's existing company. 
 
Contacts > Client Contact record > General tab > Client field 
 
 
 
 
1. Use the lookup field to change to the proper Client/Company name
2. If the Client does not exist click on +New Client.
 
 
 
 
 
Keywords: updating client contact company, company name, client field, existing client contact