Follow your required Branch process for moving a youth member between two sections/Units. Once you’ve done that, proceed with the following steps:
As an adult Leader or Unit Leader, visit the Members view, and then make sure you’re viewing a single Unit. Click ‘add Unit Member’ in the top right above the member table. Use the drop down menu to find the youth member you are moving, and select them. Their name will display on this page, and then you can click ‘add’.
The member will now be visible from the Unit view, as belonging to the Unit. They may be involved in multiple Units, and after they have finished linking you can remove them from their old Unit by clicking the ‘remove’ button from the Unit view of their old Unit.