Use the following procedure to disassociate subnets from a multicast domain.
To disassociate subnets using the console
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Open the Amazon VPC console at https://console.aws.amazon.com/vpc/
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On the navigation pane, choose Transit Gateway Multicast.
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Select the multicast domain.
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Choose the Associations tab.
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Select the subnet, and then choose Actions, Delete association.
To disassociate subnets using the AWS CLI
Use the disassociate-transit-gateway-multicast-domain