Regarding how to record CWIP

My company is constructing building in Gurgaon and assign work to serveral contractors for constuction, electrical etc. My question how to book the expenses of contactors they are giving us running bills not final bills and final bills are expected to come when work completed may be next year. If company is putting capital expenditure then how to book it and running bill of contractors? Also give the accounting entries in detail . Thanx in advance