Okay, so the idea is:
after selecting some parts in the editor show one more button - "create a group".
The effects I suggest:
Every part in a group responds to any other part activation, for example you tap on one solar array or engine or parachute and they all do their job simultaneously.
Also the fuel tanks - if they belong to one group they should all act like one when transferring fuel. If you have side boosters group then you tap left one and transfer your fuel to the core - the right one transfers its fuel too, exactly the same amount as the left one. And vice versa, if you tranfer fuel from the core to the left booster - the right one gets the same amount.
As a side effect these groups would make it possible to activate parts which cannot be tapped because they're under some other parts.
This goes for any parts that are interactable - wheels, legs, arrays, parachutes, engines, tanks and anything.
after selecting some parts in the editor show one more button - "create a group".
The effects I suggest:
Every part in a group responds to any other part activation, for example you tap on one solar array or engine or parachute and they all do their job simultaneously.
Also the fuel tanks - if they belong to one group they should all act like one when transferring fuel. If you have side boosters group then you tap left one and transfer your fuel to the core - the right one transfers its fuel too, exactly the same amount as the left one. And vice versa, if you tranfer fuel from the core to the left booster - the right one gets the same amount.
As a side effect these groups would make it possible to activate parts which cannot be tapped because they're under some other parts.
This goes for any parts that are interactable - wheels, legs, arrays, parachutes, engines, tanks and anything.