Add an delete function through external file to user module in modified oscommerce

In the administrator of this modified oscommerce shop, there's a module where you can import users through an Excel file. Client needs to be able to delete users through an Excel file too. The client gets a list of users (e-mail addresses) that can't login anymore and doesn't want to delete them one by one. Steps for the user would be: -Click the button -Browse for the file -Show number of e-mails that match the Excel document (and if there are possible errors like duplicates, unknown e-mails/text, ...) -Continue -Confirm: are you sure you want to delete xx users? (xx= number of users that will be deleted) I attached a screenshot from the interface. An extra button will need to be added for the delete function. The site uses a master/slave construction.