Add these two statements to CommerceAccelerator/Applications/
application-name
/META-INF/MANIFEST.mf
file. The first statement defines the configuration path for Business Control Center preview, the second is for Experience Manager preview.
ATG-PreviewConfig-Path: src/main/configlayers/preview
ATG-EndecaPreviewConfig-Path: src/main/configlayers/endecapreview