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In QGIS I want to duplicate a layer and then delete some polygons from the duplicate only, without deleting them from the original layer.

Is this possible?

1 Answer 1

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No, because duplicate layers share the same data source.

I recommend to 'save layer as...' with option 'add saved layer to project' checked. This copy you may edit without changing the source layer.

QGIS 3:

In QGIS 3 it's right-click the layer then 'Export... | Save Features As...':

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The option 'Add saved file to map' remains the same:

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