Replacing a negative value by "0" on a column

welcome to the community, @Damian73.
Please re-post your sample data as a PLAIN text, not using HTML table.
The code/data samples should be properly formated using markdown code tags.
You say you have a CSV file, but I don't see any C (Commas) in your CSV.
Please edit your original post with the proper formatting.
E.g. (but I don't know your data) your data might look like this - using proper formatting and CSV definition:

4061815000001,510700,0,79,N
4061815000001,520237,0,-2,N
4061815000001,520227,0,5,N
4061815000001,520220,0,20,N
4061815000001,520231,0,6,N
4061815000001,520228,0,18,N
4061815000001,520230,0,-21,N
4061815000001,520238,0,-3,N
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