Yes, you can definitely put two columns under one heading in Excel. Here's how you can do it:

1. Open a new or existing Excel worksheet.
2. Type the heading "Burger" in cell A1.
3. Type "Cheeseburger" in cell B1 and "Hamburger" in cell C1.
4. Select cells B1 and C1 by clicking and dragging your mouse over them.
5. Right-click on the selected cells and choose "Format Cells" from the drop-down menu.
6. In the "Format Cells" dialog box, click on the "Alignment" tab.
7. Under "Horizontal," select "Center Across Selection" from the drop-down menu.
8. Click "OK" to close the dialog box.

Now, the text "Cheeseburger" and "Hamburger" will be centered under the heading "Burger" and will appear as two columns under one heading. You can adjust the width of the columns by clicking and dragging the column divider between columns B and C.