If you need to add more data between column a and column b, you should place your cursor on the border of the cell so it turns into a two-sided arrow, and drag.
To input a single column in an excel one have to Right-click the full column to the right of where on want to add the new column, and then click on Insert Columns.
Note that If you need to add more data between column a and column b, you should place your cursor on the border of the cell so it turns into a two-sided arrow, and drag.
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