- In a flowchart, select the shapes you want to number.
- On the Tools menu, point to Add-Ons, point to Visio Extras, and then click Number Shapes.
- On the General tab, under Operation, click Auto Number. Under Apply To, click Selected Shapes, and then click OK.
Tip To number new flowchart shapes as they are dragged onto the page, in the Number Shapes dialog box, click Continue numbering shapes as dropped on page.