Yes, it will add a new response, because this is what it does once a survey is filled completely.
It will only continue in the old survey, if this wasn't finished. You might be able to change the status of a response to not complete, then the respondents would probably jump back into the previous response, but the problem is they would jump to the end of the survey. As I said, it is probably possible, but with a lot of workarounds. Not ideal.
It will only continue in the old survey, if this wasn't finished. You might be able to change the status of a response to not complete, then the respondents would probably jump back into the previous response, but the problem is they would jump to the end of the survey. As I said, it is probably possible, but with a lot of workarounds. Not ideal.