System can add custom fields specific for a user and the values can be added via Integration.
We can add up to 10 custom fields.
From the Dashboard, click on Account and select Users from the drop down.
Under Show Users, click Action button and select Settings from the drop down.
Under Credentials Tab, scroll down to Custom Fields
Click on Add Custom Field and enter the value.
Click on Apply Changes.
To Add information to these Fields, you need to map them through the Adaptor API.