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I would sugggested either putting your viewports on the DEFPOINTS layer or creating a specific layer for your viewports and setting it to not plot, as I assume all you want is for the viewports not to show when you plot your drawing?
Howard Walker
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You could make a viewport with a hole in it, then put the smaller viewport in the hole. Draw a polyline for the outside of the main viewport, then a smaller polyline for the hole. Use the REGION command and turn both polylines into regions. Next use SUBTRACT command to subtract the small region from the large one. Now make a viewport using the object option and select the region. Lastly create a small viewport in the hole.
Kate Morrical wrote a great post years ago about how to create a viewport with a hole in it. You can find it here.
As suggested earlier you would then place another single viewport for your detail in the hole. This idea solves the interference issue with the main model because it will never appear in the hole. There should be no need to freeze viewports either, and it may actually mess something up. If you don't want to see the viewport frames on your prints simply set the viewport layers to no plot. Viewports should always be on dedicated layers anyway, so if they're not already there make them that way. It's always easy to control how they display (or don't) if they're on a dedicated layer.
And don't forget either that whenever you have nested viewports you'll need to use Ctrl-R to toggle between them!
This should solve your problem.
Dave.
we are having the same issue. What i did was turn the viewport layer off rather than freeze it. Hope this helps