It's hard to imagine that that charger will not do storage. Equally hard to imagine that it will not display individual cell voltages.
I looked briefly at the manual but could not find anything useful. If the charger is still new I would return it and get something else. If that is not an option try and find someone or some discussion on that charger.
Failing all that it should be easy to monitor cell voltages during charge. When you reach 3.85-3.9 volts per cell stop the charge and you are at storage level.
Once ready to fly you simply begin the charge from storage level. Cycling is generally not useful or necessary with LiPo packs.