Yes you can do any of the below,
1) Create tunnels and populate them with VRF's using global source and destination.
2) Create tunnels and populate them with VRF's using VRF source and destination ( this is covered in the link posted by you)
3) Create subinterfaces with framerelay encapsulation and populate them with VRF's.
These are the options available, you have to see in your situation what is permissible and then accordingly implement the applicable solution.
HTH-Cheers,
Swaroop