Drawing AON diagram in Excel Excel can be used to draw AON when you don't have a specialized software to draw your network diagram. First create a node template that can copied again and again. This can be created using cell formatting features such as borders and merge cells. Highlight any 3 by 3 cell group in the worksheet as shown below and then apply All Borders cell formatting. Now select the three cells in the middle as shown below and select Merge & Center. You can now copy and paste this template, for each node you need in your network diagram as shown below. Then use arrow shape in Insert > Shapes > Lines to draw the arrows.
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