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In project B you can use <https://www.pulumi.com/registry/packages/aws/api-docs/ec2/getsubnets/> to get the subnets for the VPC using the `vpc-id` in the filter.

I suppose I will also need a filter to get only public or private subnets, right?

Maybe something like:`{ name: 'type', value: ['public'] }`  ?

For the getSubnets function, you are limited to the filters supported by AWS: <https://docs.aws.amazon.com/AWSEC2/latest/APIReference/API_DescribeSubnets.html>

The other option is to provide the subnet IDs as otuputs from stack A.

Yeah, I also did that, but it is not working:
```module.exports = {
  publicSubnetIds: pulumi.output(vpc.publicSubnetIds)
}```

and inside project B i have:
```const publicSubnetIds = mainStack.getOutput('publicSubnetIds');
const dbSubnetGroup = new aws.rds.SubnetGroup('db-subnet-group', {
  subnetIds: publicSubnetIds
});```

I think the fundamental issue is that the `publicSubnetIds` stack output is read in as an object and so needs to be processed a bit before being used in subnetgroup declaration.
In stackB if you do something like
```module.exports = {
  publicSubnetIdsFromA: pulumi.output(mainStack.getOutput("publicSubnetIds"))
}```
you’ll see the subnet IDs made it over to stack b.
But to use them as in the subnetgroup declaration requires some type casting or something (that I haven’t figured out yet).

Actually, this works for me:
```const stackA = new pulumi.StackReference("MitchGerdisch/quick-test/dev")
const pulumiSubnetIdsFromA = pulumi.output(stackA.getOutput("pulumiSubnetIds"))
const dbSubnetGroup = new aws.rds.SubnetGroup('db-subnet-group', {
  subnetIds: pulumiSubnetIdsFromA
});```


Actually, it works as well without the `pulumi.output()` bit:
```const stackA = new pulumi.StackReference("MitchGerdisch/quick-test/dev")
const pulumiSubnetIdsFromA = stackA.getOutput("pulumiSubnetIds")
const dbSubnetGroup = new aws.rds.SubnetGroup('db-subnet-group', {
  subnetIds: pulumiSubnetIdsFromA
});```


:tada:  Yeah, it actually works now, I am so dumb, I specified incorrect stack name inside stackReference :man-facepalming:
<@U01BSQWRZFA> Thank you soo much for your help! :raised_hands:

:slightly_smiling_face: Glad you got it working.