How to copy Level elements between VMFs? *SOLVED*

[Blue]

I'm making a "summarized" level of the White Forest Base in Half Life 2 Episode 2 (BSPs outland_11, 11a, 11b and hopefully 12 and 12a) by removing all the NPCs and Scene choreography and then copy-pasting the entities and brushes from all the different VMFs into one document in Hammer. However, I don't know how to copy-paste elements like that, or to export them. Anybody have ideas?

 

 

Actually it's as easy as Copy-pasting.

 

Copy elements, save and close VMF 1, open VMF 2 in the same Hammer session and paste.

Copy pasting does not work inbetween different Hammer windows.