I would add it to the repeating section and then use logic to default the information. It is best to keep that data together with the rest of the record for reporting and reuse anyway.
I commonly have a group of fields in my form body I call default. I create a field for each field the user will be entering into the repeating section that would be nice to remember the last entry.
Then for each repeating field I put a rule that sets the corresponding default field value to the fields value when it is changed.
Then on the repeating table properties, for default values, I set each field to use the default field on any inserted rows.
This way when they add their second row the values default from the first and they can change them by exception.
Hope that helps.