Tree Views
A Tree View is an alternative method of viewing records to a Scan Form. A scan form uses a tabular format sometimes referred to as a data grid, a tree view displays records in a pre-defined structured hierarchy.
When in change mode in a detail form a blue help icon 
may be displayed next to a field
allowing data lookup to be performed. Clicking on this icon will display a Tree
View Form which provides a structured system for locating and selecting records.
Although the actual Tree (or hierarchy) display may differ depending upon system
configuration, the key elements will remain identical:
More:
Tree View Navigation