We would like to point your attention to the fact that copying your application is better be done before the submission of the same application to any app stores, otherwise you would need to resubmit created application as a new one.
How to copy application from your ibuildapp account to your reseller site, just push “copy to reseller site” button:
This way your application will appear on your reseller user’s account on reseller site.
So no you may copy to another account on your reseller site, to do so go to /wp-admin/projects.php and press “Copy” button.
You will see the following window:
Choose user and if you have already published the app copy Android certificate (it may help you to resubmit a new build, if the app has been published).