Dependent entities are selected with an entity selector. Example: Select an Industry for a Lead.
1: Salient property of the selected entity will appear here. This field is not editable.
2 (...): Click '...' button and a window will pop up. Search and double click (OR press Enter key) on the desired row.
3 (X): Press X to clear current selection.
4 (R): Press R to report the selected entity. Enabled only if the entity is reportable.