_planBuilderConfig

'System Environment Variables' (Optional) — Specify any additional* operating system environment variables you want to pass to your build; Please note, multiple variables must be separated with spaces, and parameters with spaces must be quoted (e.g 'ANT_OPTS=-Xms200m -Xmx700m'). You can also include Bamboo global or build-specific variables (see Using Global or Build-specific Variables).
* i.e. additional to the existing environment variables (see Viewing Bamboo's System Information for a list). Note that existing environment variables are automatically available to the builder, thus you don't need to specify them in the 'System Environment Variables' field.
'Working Sub Directory' (Optional) — If you leave this field blank, Bamboo will look for the build files in the build root directory (which is assumed to be the build's Working Directory, as described in Locating Important Directories and Files). You can override this option by specifying an alternative working directory (which must be a subdirectory of the root directory). For example, if your plan has a build script in a subdirectory, and the script needs to be run from within that subdirectory, you would type the name of that subdirectory in the 'Working Sub Directory' field.