Adding Members from one group to a another

Hey Everyone,

I need bit of help. I am admin of one Facebook group with around 49k members. I have created one new group and want to add all the people in my old group to my new group. Is there any way i can do it. I know i can post on old group and ask them to join new group but i am looking for a method whereby i can add all of them to new group. I also have a facebook page, is there any way to add people who like that page to group.

Thanks