centralize procurement and make profit

Hi experts,

I have a scenario that in a group company, one of them is responsible for centralize procurement, and the goods are all delivered to each company directly. This company just sign contract with vendor using a lower price and sign contract with group companies using a higher price.

Is there any standard funtion to fulfill this process? (I know one but only if this company makes no profit)

Third-party sales is not an option because those companies also have subcontract business, real third party, etc.

Please kindly advise.

Thank you in advance.