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You can allow specific VLANs by selecting the switchport in the GUI . Go to Data>Switch>Ports and then select the switchport that is configured as a Trunk (membership Trunk). This will bring up another window where you will be able to configure the specific VLANs that you want for that Trunk.
Thanks you for the detailed answer - I found the stated menu and then was able to see the cli config after changes made in the gui. This is my first experience with Adtran and it's going to take a little getting used to.