delivery challan

sir,.

our one client is in Mumbai.
as per client instruction we handover finish goods ( material) to client courier (dhl) in our premise. I


and dhl (client courier ) is distubute good to different state. eg Maharashtra, Gujarat, Karnataka etc


I m not paid to dhl for distribution charges. paid by client only.

In above case how to prepare challan and what destination I mentioned. also what is the tax applicble .