GST query Related to distinct person if Branch office Services to head office.

GST QUERY 

As per schedule-1 Point No.2 of CGST, Act 2017, regarding supply of goods and services or both between distinct persons as specified in Sec (25) of CGST Act whether, branches which are acting as only marketing offices of a Head Office in different states are required to raise an invoice for marketing services providing by the respective branches. All branches are running only as marketing services and no sale activity is undertaken in the branches. If so whether as per valuation rules all the expenses incurred by the branch may be taken as cost of production and GST is charged on the same or and please suggest any other option for taking credit at head office end without Branch office registration. 

Please provide your valuable comments.