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cvscut -n clients.csv Now that you know the column names from your newly converted CSV source, you could convert only certain columns from the clients.csv file to another CSV file.
He is trying to take a | delimited file and strip out a single column from the data to another file. I've done this before using a get-content | convertfrom-csv | select | out-file and it worked ...
Then, switch from the Home tab to the Data tab. You can find an option called From Text/CSV here. If you cannot find this option, go to Get Data > From File > From Text/CSV.