Visio VBA - Edit Shapesheet for Multiple Items

Hello! I am working with an Org Chart and would like to select all Master objects, and edit the shapesheet for each without having to reference the specific item IDs. I have found some answers for how to add a row, but not edit an existing row. When recording the macro and manually making the change in a shapesheet, the line of code for the change itself is this:

Code:

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Application.ActiveWindow.Shape.CellsSRC(visSectionUser, 3, visUserValue).FormulaU = "0"

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I cannot crack how to select each shape in each master object and then reference the shapesheet row. Please help!