You could pass the path of the field to the resetData function to selectively reset the data in the form.
xfa.host.resetData("xfa.form.form1.Page1.Table1");
xfa.host.resetData("xfa.form.form1.Page1.TextField1");
OR
xfa.host.resetData("xfa.form.form1.Page1.Table1,xfa.form.form1.Page1.TextField1"); // Combine multiple fields into one statement..
Thanks
Srini