Refil Potions and check potions and cap to leave hunt

Hi, Good night, I'm having trouble making an action, that when the char has 300 supreme healing potions or 200 cap, he goes to the city, in the next label case, or if he still has capacity or supreme healt potions he returns to the label hunt that is at the beginning of the script, and also a purchase script for supreme healing potions, I can't get him to check the amount of potions and buy the right amount, he always buys more or less, he would need a script let him buy 1000 supreme healing potions, exactly ...
thank you very much thank you