With Visio Professional, you can import a table into 'metadata' that sits in an Excel-like table in the file.

With both Visio Professional and Standard you can use VBA to make available that tabular data but you don't have a single metadata object to 'store' the tabular data and would therefore make use the data while the macro is running to build a graphic using particular master shapes according to the rules you specify in the code.

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Andrew Lockton
Chrysalis Design, Melbourne Australia