(n) A subcontractor is a legal person appointed by a contractor to get the contract, part of the contract or any section of the contract assigned to him to be executed. A sub-contractor has got limited liability towards the original owner and his rights are limited to the mechanics lien to the extend of his unpaid bills. A subcontractors rights and liabilities are limited to the agreement he had with the original contractor. It has nothing to do with the terms by which the original contract was assigned.