I myself use dugem2016's solution for this as well, but if you want to use the GUI, via 'All Profiles' look up your profile and select it. In the top right corner there should be a 'save as' button which can be used to clone the current profiles.
dugem, you probably know this, but you can combine the creation of the new profile and the cloning into a single command:
wlan aaa profiles new-profile clone old-profile
wlan ssid-profile new-profile clone old-profile
wlan virtual-ap new-profile clone old-profile