XAN9BR'S PROFILE

Hello community. I'm using RPG Maker 2003. I'm trying to make a battle system that each character has skills / spells that can be used, requiring another technique that has been previously used by the character. Like a skill queue system. My original idea is to make a series of techniques, including branching, to give a certain range in the manner of each fight.

For clarity, what I'm trying to say:
First round the character can use for example only the magic "Concentrate." If the character using this spell in the next turn he will release the use of "Fire," "Ice" and "Bolt". If he chooses the second round to use the spell "Fire" in the third round he can use the spell "Fire 2".
Please do not judge the example is somewhat simplistic only to better understanding of what I intend to do.

Meanwhile I'm thinking in something like this: character uses a skill which is part of a certain "combo", then his battle command changes by main event that is called by a fork in each Monster Groups. The next Skill subset will have the next spells of the "combo" and so on. But that my thinking has complications and is also very limited. I dont know if anyone has done anything like what I'm trying to do, I tried the search function of the forum and i didn't found any, if anyone has any idea of ​​an algorithm that I can do to reach my goal please help me
Thank you for your attention. Sorry for the bad english.