Creating macro to automically export visio digram info into excel

[GSG9]

Hello,

I am attempting to write a macro that will automically export information contained in the custom properties of objects in a visio electrical engineering diagram into an excel spreadsheet. Specifically, i want the macro to export only the object names who have the a custom property labelled as imput or output.

I was wondering if anyone had any insight into the best way of proceeding