Eway bill scenario in case of 4 parties involved

If we make a sales invoice, which is 'Bill to Ship to' Transaction.A is making sales Invoice in the name of B with Consignee Name C. However, Actual material to be despatched to D for processing. Hence here 4 parties Involved A.B.C & D. My question is, is this type of transaction is allowed under GST. If yes, then how the e-way bill to be generated?

Thanks