SCRIPT HELP - YANFLY ENGINE ACE - INPUT COMBO SKILLS

I need help with this script (YANFLY ENGINE ACE - INPUT COMBO SKILLS). I do understand it, kinda, but what I don´t get is how to string combos into a new skill.
If I, for example, choose three skills and want that to result in a special skill, how can I perform that. I understand the roles of noteboxes in this script, but I´m not sure how to use this particular feature of how to string toether combos to form another skill.
I hope you understand even though my english is kinda... half-bad perhaps.
Not sure if this is the right forum for this question either, but please move the thread in that case.