chenchen, In order to access the additional channels of your PCI-6036e you need a SCXI-1180. This will allow you to access all of your unused 6036e channels on the front of your SCXI chassis. Once you do this you will refer to the unused channels just as if you only had the DAQ board (i.e. 0, 1, 2, 3, etc.).
I recommend calling our internal sales department at 1-800-433-3488 if you would like to purchase the SCXI-1180. Ames Applications Engineering National Instruments