- You are using SharePoint online (Office 365) environment
- You have admin access on your tenant
Step 1: Open User Profiles
Replace the YourTenantName in the following url https://YourTenantName-admin.sharepoint.com with the name of your SharePoint online environment and open it in the browser.
In the left-side menu, choose More features, then in the central part of the screen click User Profiles.
Step 2: Сlick Manage User Properties under People section
Step 3: Click New property
Step 4: Fill in the Name and Display Name for new user profile property
Step 5: Click OK button
Scroll down the page and click on OK button to create a property