Yes, you can move a bike to a different hub from the Admin platform.
Go in the 'Bikes' view, and then search for the bike you want to move. Once you find it, from the 'Actions' button on the left you can proceed to virtually move the bikes to the destined hub, selecting it from a scroll down menu that will pop out.
REMEMBER. To move a bike from one hub to another, and to relocate a bike position are 2 different operation.
Whenever you move a bike to a new hub, do not forget to also relocate that bike location using the Owner ap. You can read more about relocation here