The Line Definition workspace is the area which allows you to define the options, properties and characteristics of the row data that will appear in your report. You can customize your data and how it will appear using the Line Fields, the Properties Pane and the functions on the Lines Context Ribbon.
The Line Definition workspace is designed to allow for easy creation and management of the rows that will appear on your report. In the Line Definition workspace, you have a number of usability options for creating and managing elements and data in your workspace.