To make a tree diagram in Excel you will need to utilize third-party diagramming tools, such as Lucidchart that allows you to create a tree diagram in Excel. These are known as add-ins to the program.

Translates an excel file describing a relational database to an entity-relationship diagram generated by Graphviz. - arnoN7/er_diagram_python ...

Sankey Diagram for Excel A simple and effective Sankey diagram tool designed for Microsoft Excel users – powered by the ChartEngine add-in.

By the time we're halfway through giving ourselves vindaloo and lager poisoning, the Boss will have a Visio diagram and Microsoft Project document prepared, along with an Excel spreadsheet and graphs ...