Hi Bennyd,
Welcome to InfoPathDev.
I understand you would like to delete the rows that were created by the previous submit. In order to achieve that, you would need to use code to programmatically delete rows upon clicking a button. Another opition you could do is add a rule which closes the form and redirect it to the initial page - that way, everything is refreshed. If you wish to avoid using code, you may want to try out qRules' Delete command. Hope this helps.
Regards,