On the View tab, in the Show group, click Task Panes, and then click Shape Data. To add data to shapes that are already in your drawing, first add the data fields to your shapes and then add values. Right-click the shape, and then select Data > Shape Data.
To view the shape data for any Visio object: How to import data to shapes in your drawing Overview of importing data into Visio from an external data source The following articles discuss how to work with external data sources: This article describes how to add data directly to shapes. You can add data directly to a shapes, or (if you have Visio Professional) you can link data from an external data source to a shape.