This database demonstrates techniques relative to associating people with companies.Person Selector
Click the "+" button on the Company layout and you'll see the Person Selector layout. This technique is easier to use than a drop-down list when you have a lot of person records in the database.
The Person Selector layout is displayed in a card-style window, which is a new feature in FileMaker 16.Company - Person Join Table
Instead of assigning people to a company directly, we use what is called a join table. This table stores associations between companies and people.