@manuboss Parse Line (deprecated) - doesn't mean it's unusable, it's still usable if you want.
Or you can use an alternative method called "Parse CSV string"
You asked this question, I think you are new, and the message cannot tell you all about your problem, because there is a lot of information as well as different use cases.
So you can follow the basic instructions.
I managed to do it by splitting the proxy and port in to there own variables and adding the : in the proxy mod [[PROXY]]:[[PORT]] which pulled the proxy and port back together, i`ll try what you've suggested too.