The shipping prices let you set shipping prices per product based on the product price.
The shipping field on the list of export fields must be the custom_shipping field. RO CSVI uses VirtueMart core vmpsplugin to calculate this field.
custom_shipping field is available in Google Merchant export.
Set the custom_shipping field as one of the export field in Google merchant export.
In Google Merchant export this field gets three values on export, title of the shipment, price and country code. Sample of XML output would
<g:shipping> <g:country>IN</g:country> <g:service>Self Pickup</g:service> <g:price>78.00</g:price> </g:shipping>
If there is no matching shipment, this node will not available in export XML.