To insert a single column: Right-click the whole column to the right of where you want to add the new column, and then select Insert Columns. To insert multiple columns: Select the same number of …

If you need to sum a column or row of numbers, let Excel do the math for you. Select a cell next to the numbers you want to sum, select AutoSum on the Home tab, press Enter, and you're done.

To insert a column, pick any cell in the table and right-click. In the example shown below for rows, a row will be inserted above row 3. For columns, if you have a cell selected in the table's rightmost column, …

One quick and easy way to add values in Excel is to use AutoSum. Just select an empty cell directly below a column of data, then on the Formula tab, select AutoSum > Sum.

To add a list of numbers, select the cell below a column of numbers, and then click AutoSum.

Insert a new column into the table. You can do this by typing in the column immediately to the right of the table, and Excel will automatically extend the table for you.

On the worksheet that contains your chart data, in the cells directly next to or below your existing source data for the chart, enter the new data series you want to add.

Need more help? You can always ask an expert in the Excel Tech Community or get support in Communities. See Also Fill data automatically in worksheet cells

You can use AutoSum to quickly sum a column or row or numbers. Select a cell next to the numbers you want to sum, select AutoSum on the Home tab, press Enter (Windows) or Return (Mac), and that's it!

With Power Query, you can add an Index or Custom (you define the formula) column to your current query.