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set parent of the existing resources that you move into the component resource, then set an

aliases: [{parent: pulumi.rootStackResource}]

.. so that your options would look like this:

},{
            parent: this,
            aliases: [{parent: pulumi.rootStackResource}]
        })

Run the program for each of your existing stacks to update the relationships, once all are updated, you can remove the alias again

@better-shampoo-48884 That works perfectly, thanks!