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Creating a Mission
Without the Framework
Simply launch the ArmA 3 editor and save a new mission on the terrain of your choice. This will create a folder, in your in-progress mission folder, named whatever you saved it as but with an extension based on the terrain.
With the Framework
Create a copy of the cbb_framework_a3.VR folder and place it in your in-progress mission folder. Rename it to your desired mission name, and change the extension to one associated with the terrain of your choice.
Important Directories
In-progress mission folders are located at:
\User\Username\My Documents\Arma 3 - Other Profiles\Username\missions\
PBO files of missions that you have played online are located at:
\User\Username\AppData\Local\Arma 3\MPMissionsCache\