Removing the header from a .txt file

Greetings!

I’m trying to make a scenario that imports a file from a sales system, reformats it, and then uploads it into the accounting system. The file I’m working with is in .txt format, and I am having trouble removing the unecessary header text before the voucher lines. I found a solution using modules that run javascript, but that is not viable due to costs. The txt is uploaded.
Everything else in the scenario is working, i only need help with a solution removing the first few lines. The text in the actual lines may vary, except the one starting with “@WaVo (VoNo,VoDt,ValDt,Vot”.

test.txt (1.3 KB)