Which extra lines do you mean, do you have an example? And which 4 extra lines are you planning to use?
<project path="device/lge/hammerhead" name="CyanogenMod/android_device_lge_hammerhead" revision="stable/cm-12.1-YOG4P" /> <project path="kernel/lge/hammerhead" name="CyanogenMod/android_kernel_lge_hammerhead" revision="stable/cm-12.1-YOG4P" />
<project path="device/lge/hammerhead" name="edp17/android_device_lge_hammerhead" revision="stable/cm-12.1-YOG4P" /> <project path="kernel/lge/hammerhead" name="edp17/android_kernel_lge_hammerhead" revision="stable/cm-12.1-YOG4P" />
<project path="hybris/droid-hal-version-hammerhead" name="edp17/droid-hal-version-hammerhead-12.1" revision="master" /> <project path="hybris/droid-configs" name="edp17/droid-config-hammerhead-12.1" revision="master" /> <project path="rpm" name="edp17/droid-hal-hammerhead-12.1" revision="master" /> <project path="vendor/lge" name="edp17/proprietary_vendor_lge" revision="stable/cm-12.1-YOG4P" />