How do I remap fields in Visio shapes when pointing to an external data source?

Hi,

I'm creating an organizational chart (org chart) in Visio. It refers to a SharePoint list. in the SharePoint list there is a column called FullName. This is the one I want to map to the Name field in a Visio shape. How do I remap fields in Visio shapes when pointing to an external data source?

Learning SharePoint