You can disassociate a transit gateway route table from a transit gateway attachment.
To disassociate a transit gateway route table 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 Route Tables.
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Select the route table.
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In the lower part of the page, choose the Associations tab.
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Choose the attachment to disassociate and then choose Delete association.
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When prompted for confirmation, choose Delete association.
To disassociate a transit gateway route table using the AWS CLI
Use the disassociate-transit-gateway-route-table