Line Definitions can be deleted from the Lines Navigation Pane if they are no longer required.
Prior to deleting any Line Definition, check that the item is not currently associated with any Report Definitions. In this instance, you will not be able to delete the Line Definition and will receive the following warning message.
To delete a Line Definition:
1. Click on the Lines bar to open the Lines Navigation Pane.
2. Select the Lines Definition to delete.
3. Click
on the Delete 
icon, or,
right-click and select Delete from the pop-up menu. You will receive the
following prompt to confirm your deletion:
4. Select Yes to confirm your deletion.
Additionally, you can delete multiple Line Definitions and/or Line Definition Folders from the Lines Navigation Pane by selecting the items using the Shift key and mouse-clicking on the items. Then, use the right-click to select the Delete option from the pop-up menu. Multiple items can be deleted where all the items are at the same level in the Navigation Pane’s tree. If a Line Definition and a folder are selected for deletion, then the folder must be empty.
Note: If you do not wish to receive confirmation messages on deletions of Prospero items (Column Definitions, Line Definitions, Report Definitions or Tree Items), check the “Do not show this message again” checkbox. You can re-enable confirmation messages by selecting the “Prompt before deleting” checkbox on the Local Settings Options screen