Insert or delete rows and columns - Microsoft Support
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 columns to the right of where you want to add new ones.
Create a drop-down list - Microsoft Support
You can insert a drop-down list of valid entries (also called a drop-down menu or drop-down box) in Excel to make data entry easier, or to limit entries to certain items that you define.
Ways to add values in a spreadsheet - Microsoft Support
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, click AutoSum > Sum. Excel will automatically sense the range to be summed. (AutoSum can also work horizontally if you select an empty cell to the right of the cells to be summed.)
Use AutoSum to sum numbers - Microsoft Support
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. When you select AutoSum, Excel automatically enters a formula (that uses the SUM function) to sum the numbers. Here’s an example.
Create a simple formula in Excel - Microsoft Support
How to create simple formulas in Excel using AutoSum and the SUM function, along with the add, subtract, multiply, or divide values in your worksheet.
Use calculated columns in an Excel table - Microsoft Support
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. In this example, we created a new column by typing "Grand Total" into cell D1.
Add or remove items from a drop-down list - Microsoft Support
After you create a drop-down list, you might want to add more items or delete items. In this article, we'll show you how to do that depending on how the list was created.
Insert subtotals in a list of data in a worksheet - Microsoft Support
You can automatically calculate subtotals and grand totals in a list for a column by using the Subtotal command.
Resize a table by adding or removing rows and columns
Add a row or column to a table by typing in a cell just below the last row or to the right of the last column, by pasting data into a cell, or by inserting rows or columns between existing rows or columns.
Automatically number rows - Microsoft Support
Unlike other Microsoft 365 programs, Excel does not provide a button to number data automatically. However, you can easily add sequential numbers to rows of data by dragging the fill handle to fill a column with a series of numbers or by using the ROW function.
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