Hello Gayathri,
I do not know much about GBI. I hope that someone else can help...
My rough understanding is that GBI (Gateway / BOPF Integration) is technically based on (or related to) FBI (Floor Plan Manager / BOPF Integration). So, GBI might be useful for you if you already have experience using FBI. But I hope that there are some GBI experts watching this thread.
Kind Regards,
Ivo