I flip real estate for of my business. Do I use cost of inventory& cost of goods sold? I have 1099's for the sale proceeds & need to know where I input all my deductions.

Any insight as to how to input my deductions for the cost of rehabs would be great!  I know it will be on a schedule C but there are many expenses for the flips and not sure if I can lump them or must itemize each one. Can it be done through cost of good sold? Thank you!