No its not possible. The POS have id linked to your merchant account. All the money first reaches your merchant account and then after due checks, its transferred to the respective bank account.
You have to hack the merchant database where it links the merchant id to bnank account and make changes there.
Other option would be to get the merchant id from the same merchant and in the machine change the merchant id to your merchant id, what it will essentially do is, think that that POS is ur businesses and then it will put all the funds in your account. But long story short. Too much electronic trail will be there to trace it back to you and then BOOOOOOOOM.
What you can do is, carry ur own pos and swap it with the original merchant and then at the end of the day take your own pos back with you.
But you have to make your working pos same model and make sure the receipts look similiar to the original business you are trying to scam.
peace