field association

Is there a way in which to associate fields in Drupal 7?

For example I have two content types (1) is a client information form that has the client's business name and all the details of all the relevant persons we deal with from that company (there could be up to 40+ people) i.e their tel numbers, email addresses, etc and (2) is a client job form which details a specific job (we could do 100's of separate jobs just for the one company).