Hi John,

You're right that Excel doesn't have a built-in feature to create 3-dimensional plots over three dimensions. However, there is a workaround that you can use to create a 3D plot in Excel.

Here are the steps to create a 3D plot in Excel:

1. Enter your data into Excel. You will need three columns of data: one for the x-axis, one for the y-axis, and one for the z-axis.
2. Select the data range that you want to plot.
3. Click on the Insert tab in the Excel ribbon.
4. Click on the Surface chart type in the Charts section.
5. Select the 3-D Surface chart subtype.
6. Excel will create a 3D chart over two dimensions (x and y) with the z-axis represented by the height of the chart.
7. To add the third dimension to the chart, you can use a color scale or a contour plot. To do this, click on the chart to select it, then click on the Chart Tools tab in the Excel ribbon.
8. Click on the Format tab in the Chart Tools section.
9. In the Current Selection group, select the Series option.
10. In the Format Data Series pane, select the Fill & Line tab.
11. Under Fill & Line, select the Gradient Fill option.
12. Choose a color scale or a contour plot from the options provided.
13. Adjust the settings as needed to customize the appearance of your 3D plot.

I hope this helps you create the 3D plot you were looking for in Excel. Let me know if you have any other questions!