Kindly help on the below issue : A consolidated amount was paid by headoffice for an indirect expense incurred for various branches across various states. GST was also there for the expense incurred. Now, the expense has to be transferred to respective branches. Is it mandatory to issue and invoice/bill of supply or any kind of document for the same? Suppose the expense is for a small item bought ( NOT AN ASSET) and that is to be transferred to branch, what should be the treatment?