I want to make it so everytime player 7/8 kills a specific unit, they get a spawned unit back in their base. How would I do this without a load of triggers? I'm already using the kills/razing scores to give the player minerals.

this first sentences is a bit wierd...
use score for minerals

PLAYER: 7/8
-------------------
CONDITION: Kill score is EXACTLY X
-------------------
ACTION: Preverse Trigger
ACTION: Comment
ACTION: Subtract Kill score: X
ACTION: set recources for Player 7/8 : add Y minerals

Replace X with the unit score the specific unit gives
Replace Y with the amount of minerals deald out

That doesn't work at all. So lets say X is 50 because the unit in question is hero zerglings. If you kill a ultralisk for 500(?) kill score, then this trigger will never trigger.

You're best off just using the kills condition, and using a program to make 1000 or howmany of that trigger.

Now DeVouReR's method is functional if you make one of those triggers for each type of unit, however there are multiple problems:
1. Not every unit has a unique kill score value.
2. It is possible for more than one unit to be killed per trigger cycle.

It may be the right answer in a specific case, but not in the general case.

Isn't he asking that when players 7/8 kill a special unit it gets created at their base?

The topic is kills for minerals, so that's what was confusing.

Anyways:
Player: 7, 8
Conditions:
Kill:
CurrentPlayer kills at least 1 Kerrigan
Actions:
Create 1 Kerrigan at base

Player: 7, 8
Conditions:
Kill:
CurrentPlayer kills at least 2 Kerrigan
Actions:
Create 1 Kerrigan at base

Player: 7, 8
Conditions:
Kill:
CurrentPlayer kills at least 3 Kerrigan
Actions:
Create 1 Kerrigan at base

And repeat with a script.

This. "Specifc unit" not any

Devos suggestion would work - for the most part, since he's using kills score already, which means it's always 0. It would not work however for splash kills or simultaneous kills.

If you want it perfect but not willing to create tons of triggers use Perfect kills to cash

There may also be an undiscovered elegant way of doing this with EUDs. What you'd want to look for is what value changes to trigger the function that changes the kills counter, or something of the sort. Anyways undiscovered. Complex, not supported by current tools, ignore.

Oh ya I forgot about that method.

Still, for tracking kills for a specific unit it's best to just use 500 copies of a trigger with the kills condition, much more straight forward.

... and much larger map. And a limit.
You also need an extra program changing the numbers for you.

yea i jumped into this forum but they all teach you how todo a bunch of thing i dont really understand. i want to create a map that has no peons to mine just get minerals for killing enemy units a buildings but i dont know how to do that i tried that trigger that sais add minerals to player for killing exactly 1 xxxx units and i put it on preserve but it doesnt seem to work

plees hel
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Read the wiki on kills to cash. Everything you want is in there. Ask questions on what you don't understand about it, so we can provide a detailed answer. Right now you're asking a question without enough information to answer.