How do the Class Overrides Work With Design Layer Viewports?

I was discussing Class overrides with a client. They wanted to know more about the relationship of class overrides in Sheet Layer viewports and how they relate to the Design Layer viewports.

When you use a design layer viewport, you can use class overrides. But when you make a sheet layer viewport from that design layer, what happens to the class overrides.
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You have the choice to use the existing class overrides in the design layer viewport, or you can choose to use new class overrides in the sheet layer viewport.

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