You may link inputs or outputs by using the front panel of the device or the XConsole software.
To link input or output channels on the front panel of the device,
Simply press one of the input or output Channel buttons.
Holding it down, press any other Channel menu button(s) in the input/output group. The green menu LEDs for the linked channels will be lit. Any modification of the data for the selected linked channel will be applied to the linked channels as well. To cancel linking, just press any other Channel menu key or the Exit key after releasing the held key.
To link inputs or outputs in the XConsole software,
at the top of the software, select "Setup" and "Link".
Choose to link inputs or outputs and select the desired modules.
You can select your device and channel to link in the dropdown menus on the right.
Click "Ok" to confirm your changes.