To select required columns in a CSV file using PowerShell, you can use the Select-Object cmdlet. First, you need to import the CSV file using the Import-CSV cmdlet. Then you can pipe the output to Select-Object and specify the columns you want to select by using their names. For example, to select columns "Column1" and "Column2" from a CSV file named "data.csv", you can use the following command:
Import-CSV data.