HCM Extract - Loop back with 2 HDL files

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I have a HCM Extract which produces worker.dat (to update e-mail address) and user.dat (to update user account). These files need to be imported back into HCM. I have defined delivery options for both files as Inbound interface. On the refine extract how can i map the two files to run after the other through the import and load process. 

Any suggestions on this would be appreciated. 

Thanks, 

Krunal Patel