Integrating a Charged Attack Into My Existing Attack Function

[Zeryphim]

I have been working at implementing a charge attack into my Heavy Attack combo function, for one or all attacks in the combo.
I was wondering if it is possible to easily integrate it something like that into my existing function, so that one of the attacks in my combo specifically can be chargeable, if they would all have to be chargeable, or if I would need to look at rewriting the whole thing.