Follow the new post guidance, post test data in the form of a datastep, you can follow this post if you don't know how:
Then show what you want out at the end from that test data. At a guess you can retain a variable across and concatenate each row onto it. However bear in mind that a single variable has a limit to what it can hold, if you ut lots of text into one variable its likely to not fit - which is why it is on multiple lines in the first place. I would question why you want to do this in the first place?
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Learn how use the CAT functions in SAS to join values from multiple variables into a single value.
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