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If you’re trying to replace what was once a cloudformation stack that set up the vpc and exported the vpc Id with a pulumi stack that sets up the vpc, then I think you have two choices:

1: change the dependent cloudformation stack to take the vpc as an input rather than importing it.
2. Replace the old vpc cloudformation stack with a new dummy cloudformation stack that takes the vpc is as input, then exports it so it can be imported by the other cloudformation stack.

^ thanks - I just started doing No.1 - didn't think about doing No.2! Thanks, going to look into No.2 right now.

If you do #2 you may need to make the dependent cloudformation stack explicitly dependent on the dummy cloudformation stack in pulumi, because the cf import is not derived from any pulumi output and hence pulumi won’t implicitly see the dependency

<@UT4F0KBB3> doing the dummy stack works an absolute treat!!

```dummy_vpc = cloudformation.Stack(
    'DummyVpc',
    name=f'{Env}-vpc',
    parameters={
        'Env': Env,
        'VpcId': vpc.id,
        'VpcCidr': vpc.cidr_block,
        'SubnetPublic1': vpc_subnet_data['PublicSubnet1'],
        'SubnetPublic2': vpc_subnet_data['PublicSubnet2'],
        'SubnetPublic3': vpc_subnet_data['PublicSubnet3'],
        'SubnetPrivate1': vpc_subnet_data['PrivateSubnet1'],
        'SubnetPrivate2': vpc_subnet_data['PrivateSubnet2'],
        'SubnetPrivate3': vpc_subnet_data['PrivateSubnet3'],
        'SubnetPrivate1Cidr': vpc_subnet_data['SubnetPrivate1Cidr'],
        'SubnetPrivate2Cidr': vpc_subnet_data['SubnetPrivate2Cidr'],
        'SubnetPrivate3Cidr': vpc_subnet_data['SubnetPrivate3Cidr'],
        'VpcSecurityGroup': vpc.default_security_group_id
    },
    template_body=open('formations/vpc_dummy.yml').read(),
)```

thank you! literally saved me hours banging my head against the table!