1. Explain tabs: association / additional / document
2. If there is a field which does not match the Association Fields, you can map it in Additional Fields 
3. Document Maps

1. Unique Keys are to create the basic of the Organization chart (which fields are mandatory)
2. The Organization keys will allow you to filter your Organization chart
3. The Org chart position key and Org chart Employee key are for the "large view" of the employee/position data, to enable the automatic configuration of this view