System Configuration : I/O Setup : Creating New Paths : Auto-Create Sub-Paths Option

Auto-Create Sub-Paths Option
For input, bus, and insert paths, enable the Auto Create Sub-Paths option to have Pro Tools automatically create the default set of sub-paths for the path format (channel width), as follows:
 
Main Path
<main path name> followed by channel designation .L and .R
1 Stereo (LR), 3 Mono (one for each channel)
Stereo: <main path name>.LRMono: <main path name>.L, .C, .R
1 Stereo (LR), 4 Mono (one for each channel)
Stereo: <main path name> .LRMono: <main path name>.L, .C, .R, .S
1 Stereo (LR), 4 Mono (one for each channel)
Stereo: <main path name> .LRMono: <main path name>.L, .R, .Ls, .Rs
5.0 – 6.0 – 7.0
1 Stereo (LR), 5–7 Mono (one for each channel)
Stereo: <main path name>.LRMono: <main path name>.L, .C, .R, .Ls, .Rs, and so on
5.1 – 6.1 – 7.1
1 Stereo (LR), 6–8 Mono (one for each channel)
Stereo: <main path name>.LRMono: <main path name>.L, .C, .R, .Ls, .Rs, and so on, and LFE