Is there a way to change the submitter on an expense report?

Administrative Assistances submit expense reports on behalf of several employees.  They are asking to be able to change the submitter name on an expense report to another employee that they have authorization to submit expense report for.   There have been multiple occasions when they forget to change the name before creating the expense report and have had to do significant re-entry to correct the error.  Is there a way to change the expense report owner/submitter name once the expense report has been created that we are not aware of?  Has anyone implemented similar functionality?   If so, was it a customization