If you're an account owner of Procore, you will want to make sure to specify which people in your Directory are employees of your company.
Why is this important? It's important to specify when Procore users are employees of your company. This ensures that various Procore tools restrict available options to your employees. Employee data is also used by Procore to populate certain drop-down lists with the names of your company's employees. These lists are also available as filters for refining data in some reports.
Some examples of Procore Tools that use employee data:

Note: If you want to add time entries for people in the Timesheets tool who are not in your Directory, see Add a Worker.