Rommel released a new editing tool on the BI forums which converts SQF files from the 3D editor to SQM files which can be accessed from the default ArmA 2 mission editor.


Quote Rommel :
It is a Ruby script program run through either Six Updater or the stand-alone Ruby interpreter to convert Sqf files from the 3D editor (accessed via Alt-E in the main menu) to Sqm files which can be accessed from the default ArmA 2 mission editor. It is currently in beta, units are not supported for conversion, nor triggers or markers. But they will be soon.

Best read the documentation, it has lots of pretty pictures to help you through, I won't be assisting people with already-answered questions. Either read the thread or ask another community member.