Simply put no there is no way of syncing two box remotes to the v6 it pairs with one handset at a time, as they are bluetooth they do this so that you don't control more than one box at a time. But also they do work on Infared aswell so will control any v6 as a standard anyway.
If you want to sync the virgin remote with the relevant box then follow these steps :
1.) Press home button, then navigate right over too the side menu that has settings near the bottom of the list.
2.) Click to go into settings then navigate down to devices click ok.
3.) In devices go to pair remote and follow steps on screen.
If this isnt what your asking and want to know how to sync the virgin remote to the tv there is a repartees process for that. See video link below :