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To perform column editing in vim, follow these steps:

1. Open the file in vim.
2. Enter visual block mode by pressing Ctrl + V.
3. Select the column that you want to edit by moving the cursor.
4. Once the column is selected, use the appropriate command to modify the text. For example, if you want to add a '#' symbol at the beginning of each line, type I# (capital I followed by the symbol) and then press Esc. This will add the symbol to each line in the selected column.
5. To exit the visual block mode, press Esc.

You can also perform other operations, like deleting or replacing text in the selected column, by using the appropriate commands, such as d (delete) or r (replace).