HP company may or may not be vendor
HP NBFC company is generally only for finance they procure assets and give them on HP to others.
its a step by step process

it is big topic , we explained in detail with technique to remember these points in our videos
it cannot be explained here on this platform
we can clear doubts here 
we wont able to teach through this medium
i hope you understand
i while to keep typing through out the day if we start explaining this big concept , it is not practical to teach here