An individual is the common 100% shareholder of two S-Corps, both in the e-commerce industry.  S-Corp A pays for all advertisement bills and receives reimbursement from S-Corp B. S-Corp A writes off 100% bill payments and recognizes income when receiving S-Corp B's allocated expenses.  

When we prepare the two Form 1120S, are we required to disclose related party transactions or the existence of the controlled group and the members within?  If so, how can we report this?  

Thank you!