How to invoice Inter State transactions

The transaction you want to execute is a variant of  "Bill to"  "Ship To" model.

A is seller in Maharashtra,   B is Buyer in Gujarat and  C is Consignee in Delhi

A's  invoice will show Buyer name & address of  "B"  and Consignee name & address of "C".   A will charge IGST and Place of Supply will be location of B.

Transporter can carry goods direct from A to  C.

B will raise a separate Invoice to C, charge IGST and mention Place of Supply as location of C.

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If you design the transaction with B taking delivery in Gujarat in between then,

A issues Invoice with Buyer & Consignee shown as "B", will charge IGST and Place of Supply will be B's location.

B will then issue invoice with Buyer & Consignee shown as "C", will charge IGST and Place of Supply will be C's location.