Hi Pravithra,
kindly check the following wiki How To...Content conversion module with J2EE JMS adapter - Process Integration - SCN Wiki
There you have the parameter, e.g Plain2XML xml.recordsetStructure NameA,1,NameB,*,NameC,1
If you use the * it means in can occur multiple times like 0..unbounded. If your flatfile does not contain any structure E and F, file content conversion will skip these substructures.
Make sure your xsd in ESR has these structures E and F optional, too.
E.g. in your case: xml.recordsetStructure SubstructureA,1,SubstructureB,1,SubstructureC,1,SubstructureD,1,SubstructureE,*,SubstructureF,*
For a more deep understanding kindly check the following blog posts and documents. Thanks to Eng Swee Yeoh:
FCC parameter reference for MessageTransformBean module
Kind regards
Konrad