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you’re likely looking for stack references <https://www.pulumi.com/learn/building-with-pulumi/stack-references/>

the other part is getting already existing resources, for those you can use the `get_*` functions, which don't import the resource into the current project/stack, but gets all the properties. In your case the `get_subnet`
<https://www.pulumi.com/registry/packages/azure-native/api-docs/network/getsubnet/>