How could i write parent child relation records into flat file

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Hi,

I have a Hierarchical record structure as Record A as parent and It contains 1 or many Record B childs . and Record B contains 1 or many Record C as grant childs . It is just like a tree structure which i want to out put into a file . How can i perform with the File I/O operation templates .

      If i make a configured operation with FixedLength output(hierachical ) then in the integration script how can i assign the tree data to the input of configured operation .

thanks & regards

raghu