Cannot assign global policy package to ADOM

Hello,

I have created a very simple header policy in FMG using the gOutside interface as source interface. When I tried to assign this policy to the ADOMs, I got the message: "Interface/Zone gOutside does not exist in ADOM level." Please help me resolve this issue. I understand that the gOutside interface object does not exist, but I don't see how I can map a global interface object to an interface object in an ADOM. The documentation and the FMG training material are not very helpful...

Thanks