How do I un link a table from another table? Can I link one table to a number of tables? Can I link a single entry to another table?

How do I un link a table from another table? Can I link one table to a number of tables? Can I link a single entry to another table? Eg tables:- Workers

                                       Field Hands

                                       Packers

                                       Machinery Workers

Can i attribute individual workers to any of the other tables ? John,     Peter, harry are field hands, Mary , Jane are Packers, Dick and Fred are Machinary Workers----- All are in the table of Workers