I'm guessing you are on WF5, so I've got no idea where I would look for these in menus there, but in Creo 2 it goes as:
Select the sketch feature --> Model tab --> Paste Special --> Adv reference configuration --> Pick references you need to change
or
Select the sketch feature --> Model tab --> Operations dropdown --> Copy in menu manager --> and then it's go figure by reading the command line.
Did I just call it a command line? 