System Configuration : I/O Setup : Editing Paths : Selecting Paths

Selecting Paths
Individual and multiple paths can be selected in the I/O Setup Path Name column. Selected paths and sub-paths can be reordered higher or lower in the Path Name column to change their menu order in track Input, Output, Insert, and Bus selectors. Paths can also be deleted. Sub-paths follow their main paths when they are moved in the I/O Setup.
To select a main path or sub-path:
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To select a range of paths:
1 Click the path name.
2 Shift-click an additional path name.
All paths between the first selected path name and the additional path name will also be selected.
To select or deselect noncontiguous paths, do one of the following:
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Command-click (Mac) or Control-click (Windows) path names that are un-highlighted to select them.
– or – 
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Command-click (Mac) or Control-click (Windows) path names that are highlighted to deselect them.
To select all paths and sub-paths:
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Option-click (Mac) or Alt-click (Windows) any path name that is un-highlighted.
To deselect all paths and sub-paths:
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Option-click (Mac) or Alt-click (Windows) any path name that is highlighted.