I got a little bit the same question. So can't answer yours sorry.
I have new data from the same persons. So I have to put all the answers together in 1 file.
First question is then, do I have to make the new variables again in the second file before I merge them with the first file? Or how can you let this automatically (copy the syntax from the first file in the second file?) ?
Second question, how can I pair up the same persons?
Thanks in advance,