Import - not working

Hi all!
How can I insert blocks from another dxf file? or whole dxf to another dxf file ?
I thought that it maybe through  'Import' but it not working in my LibreCAD.

ps. Thanks for the program!    

The solution is here:
"Quick Question about blocks"

http://librecad.1049103.n5.nabble.com/Quick-Question-about-blocks-td4964356.html

Thanks a lot Rallaz!
That fixed my problem.