Free of Charge delivery

Hello All,

The Free of Charge Delivery process in SAP, how does that works, and how till in the end the financial posting is done for such kind of products, for example if the goods are given away as a sample, what should be the right way to do the posting in finance ?, and if they are given away as free, what should be the correct way to show this in finance ?

also what are the normal item categories for such scenarios, where does TANN fits in ?

I understand it is better to have its own sales document type to process such scenario, what kind of cost center and profit center should be used in this scenario ?

Regards