XML Schema edit
 

I have a large amount of history imported from daily xml files that further
generate daily reports. My xml file has a new field in it and my data in
excel returns a data vailidation error because the field is not mapped in my
current schema. i cannot find a way to edit the schema to add this field.
i'm no programmer either. so, any suggestions other than setting up a new
schema in a new file and re-importing the last say four months of daily
reports?