Guillaume;
The method you are looking for the RouteSignal which is part of the DAQTools object. By using that method you can select the signal you want to route and the destination pin you need that signal to be routed to. For more information on how to use that function, you can refer to the ComponentWorks on line help, and you can take a look at the NI-DAQ shipping example for ComponentWorks named Simultaneous Sample Clock E-Series, which you can find at C:\Program Files\National Instruments\NI-DAQ\Examples\Visual Basic\Synchronize\Simultaneous Sample Clock E Series.
Hope this helps.
Filipe