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I'm just a fellow user, so please treat this as the result of one quick test rather than a definitive answer.
I set up a simple page with 4 shapes assigned to two layers (TestLayer and TestLayer2). Two of the shapes had a date Field inserted through Insert > Field. I've attached screenshots of the page and the Layer Properties dialog.
In Layer Properties, the # column showed 4, which matches the 4 shapes on the page. The # value looked the same with and without the Field in the shapes. From this test, the # count didn't seem to take the Field into account at all. It only seemed to follow which shapes are assigned to the layer. This is only what I saw in my own test, so I can't say it holds in every case.
I'm still not completely sure what you want to achieve, so a bit more detail would let me test more closely:
- What should the Field display: the number of shapes on a layer, the number of layers on the page, or something else?
- Where do you want it to appear (inside a shape, in a title block, etc.)?
- Which Visio version are you using, and what did you try in Insert > Field so far? A screenshot of your Layer Properties dialog would also help.
Please let me know more details.