If none of the flights have a NW flight number or are operated by NW, the itinerary will not show up on NWA.com and you can't change that.
This is a CO ticket with what sounds like CO flights -- your FF# does not affect which websites your itin shows up on.
If, for instance, you had a segment on NW included in that ticket, NWA.com would show you the reservation and you would receive an NW confirmation code along with your CO confirmation code. Again, though, if you have no NW segments or flights, you can't do that.
CO confirmation codes will not work on NWA.com and vice versa.
-RM