If you have a CSV file that you are working on with Notepad++ and want to add a new column at the start, end, or middle of it, then you should get the CSV Lint Plugin.
Once installed, go to Plugins: CSV Lint > CSV Lint Window
First click on the "Detect Columns" button, your CSV file will be validated and column headers will be detected.
Now click on "Add Column" to add a column. Now based on the original column you select, click Ok.
You will see that a new column will be introduced which you can edit and add data.
Day,Visits,Visits (2),Sales
1,2000,0000002000,10
2,2409,0000002409,14
3,3405,0000003405,30
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