Hi,
As per my knowledge, currently there are no APIs available to export only subreport.
See the RAS SDK dev guide and API Reference.
http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/xi4_rassdk_net_dg_en.zip
http://help.sap.com/businessobject/product_guides/sapCRVS2010/en/xi4_rassdk_net_api_en.zip
Try the SAP Idea Place and log an enhancement request.
- Bhushan
Senior Engineer
SAP Active Global Support
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