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Hi Gavin,
right to top up your twins from another cylinder you need a decanting whip. thats it.
i got one from the last dive show for just under £30.
all you do is screw on on to a pilar valve of your twins & one onto your full 15l, then close the isolating manifold (if you have) once the manifold is closed just open both the 15l valve and the twin valve. when the presure has equalised (youll be able to tell when the noise stops)only takes a min, shut both valves and repeat the process on the other side of your twins.its done that way so you get thebest fill possible from the 15, you dont get quite the same presure if you just fill with the isolator open.
there thats it - and theres a dive show comming up so you should get lucky
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