In _zombiemode_perks.gsc

set_zombie_var( "max_perks",						4 );							// Set to how many perks you want to initially limit the players to

Most people like a buyable perk slot. If you are interested in a buyable perk slot:

Spoiler: click to open...

buy_perk_slot()
{
perk_slot_trigger = getEnt( "perk_slot_trigger", "targetname" );
	level.buy_slot_cost = 5000; //Cost of perk slot, feel free to change
	perk_slot_trigger SetCursorHint("HINT_NOICON"); //Gets rid of hand symbol 
	perk_slot_trigger UseTriggerRequireLookAt(); //Requires the player to look at the trigger to use it
	perk_slot_trigger SetHintString("Press &&1 To Buy Perk Slot [Cost: " + level.buy_slot_cost + "]"); //Hint string players will see

		while(1) //Loops so players can use it more than once
			{
				perk_slot_trigger waittill( "trigger", player ); //Waits until player uses trigger
 
				if(player.score >= level.buy_slot_cost) //Checks to see if the player has enough points
					{
						player maps\_zombiemode_score::minus_to_player_score( level.buy_slot_cost ); //Subtracts the cost from the player's score
						player.max_perks++;; //Increases the player's perk limit by 1
						perk_slot_trigger SetHintString("You Have Bought Another Perk Slot"); //Displays this message to the player
						playsoundatposition("cha_ching", perk_slot_trigger.origin);
						wait 3; 
						perk_slot_trigger SetHintString("Press &&1 To Buy Perk Slot [Cost: " + level.buy_slot_cost + "]");
					}
			}
}

Instuctions:
1) copy the code and paste to the bottom of mapname.gsc
2) in mapname.gsc look for the function

maps\_zombiemode::main();

under that add:

thread buy_perk_slot();

3) add a trigger_use in radiant and give it the kvps: targetname-perk_slot_trigger

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