Set Up Project Level Employee Field Requirements
At the Project level, you can decide which fields are required on worker profiles.
1) Click on "Project" in the left navigation & select the correct project, then click on "Settings". You will see a button for Employee Field Requirement Settings".

2) Toggle on any fields you would like to be required for workers on your Project. Then, click save.
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3) If you don't see a field that you would like to track, click "Custom Fields" in the projects menu on the left. You will be able to add & configure additional fields as needed.

Note: Companies have their own set of required fields for your own employees. The settings in this article only dictate required fields at the Project level (see instructions for Company settings here).