Mating to a route after route is finished

I have a problem and am not a "gun" user of SW
I have created a route and i don't want to finish with a flange iwant it to end in an open pipe then i want to add a ball valve tothat pipe.
in SW 2007 i was able to do this i presume through differentsttings i have recentlt upgraded to 2008 and now i cannot do thisfor instance i used to insert a valve then i would select edge ofroute ( it wouldn't allow the face ever) and mate the valveconcentric then choose the same edge and an edge on the valvemating it coincedent this worked fine now i can't do it as i said iam not a pro it is probably something really stupid! pleasehelp.SolidworksRouting