How can I disassociate / Delete a client from a project

How can I disassociate / Delete a client from a project

Once I associated a project with a client in CRM, when I try to Delete the contact from the project I get this message " Do you want to remove this client & client users from this company"  this looks to me like it's going to delete the client from CRM.  I don't want to do that.  I just want to dissasociate the client from the project.  

What I actually want is to remove all the client contacts from the Client Users.  I want to be able to associtate a project to a Client but I don't want any "Client Users" to be added to the project.