If the phone is running Android 4 or later that feature has been removed. You can only use the external card for media storage.
There are tricks to allow you to use a partition on the card for app storage, but you will need to root the phone to do this (i.e. hack it to gain administrator access). This process will invalidate your warranty. If you want to know more about this, you should look in Galaxy Grand Quattro - All Things Root - Android Forums.
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