We achieved this in BPC NW.
Have created a custom process chain and had included multiple convert tabs accompanied by File connection tabs and the files are getting generated and got published onto the %USER/Privatepublications/DataManager/DataFiles folder and this was done using Info commands in the Advanced script of the Package.
We did not require to use Output delimiter as default when an output file gets generated it will be in comma format.
So,The user select an import file and transformation and trigger the package and then the first convert and file connection tab reads that import file and transformation and generate first file and publish onto private publications/DataManager/DataFiles folder and that file will become an input in the second convert tack and the second file connection generate another output file and that we dumped onto a DSO in BW and then the second output file became input to 3rd convert task and 3rd File connection tab generated 3rd file.All have been included in one process chain and User has to run only 1 package.
Thanks for your replies on this......