Note: Make sure to perform a backup before following the steps below.
As some of you want to move the VLAN configuration or Interface configuration in XG from one interface to another, there is no way to do this in the GUI. So you could use the Import/Export feature in XG, to perform this operation.
Another use case would be to add as many VLANs as you want, with this approach.
Cross reference: https://community.sophos.com/xg-firewall/f/recommended-reads/122450/creating-xml-objects-with-notepad-for-mass-import