Shipping rate plugin provides hooks that allow us to customize its functionality. One of this is how to change the shipment type from shipping rate to other shipment type.

In this code we’ll change the shipping rate shipment type into parcel quotation shipment type.

Copy and paste this code to your theme functions.php file.

function my_update_shipment_type( $shipment_id, $form_data ){
   // "parcel-quotation" is the value for the Parcel Quotation Shipment type
   update_post_meta( $shipment_id, '__shipment_type', 'parcel-quotation' );
}
add_action( 'wpcsr_after_save_shipment', 'my_update_shipment_type', 11, 2 );