Is it possible to get combined multiple shipments from a single order on to one invoice?

A single customer order can contain multiple shipments. If you want to combine all of the shipments from a customer order into to a single invoice, you can use the FBA Fulfilled Shipments Report and the ‘All Orders’ reports from the Reports API section. If the shipments from a single customer order are spread across multiple FBA Fulfilled Shipments Report reports, you can use one of the ‘All Orders’ reports from the Reports API section to return order item identifiers from a single customer order.

You can then cross reference the order item identifiers from the ‘All Orders’ report and from one or more Fulfillment by Amazon (FBA) reports to obtain the ship to address and billing address for the items in single customer order.