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how you can add rule to existing security group that is already created by another pulumi project ?

You only need a security group ID to do that, so export the ID from one project and import to the other as a StackReference.

It's not bad practice per se, but I'd strongly recommend adding a comment to the code that creates the group, listing all the projects that use that ID. If the group needs to be recreated (e.g. a name change), you'll need to remove all the rules in all the other projects first, to allow that to happen. Very awkward.

thank you a lot <@U012UJTT55M> :slightly_smiling_face: