You can add a column in Excel by right-clicking or using the “Insert” option. These features are helpful for adding new data to a spreadsheet.

Let's say you're working in an Excel worksheet and realize that you need to insert additional rows of data. Luckily, Excel has a built in feature to allow users to insert multiple rows.

Click "File," "Open" and browse to your second Excel file. Double-click the file to open it. Repeat the steps for each new file you'd like to open in its own window.