Taking out Characters

[Ҩᴜᴇᴇɴ]

Hi.
I see some packs with reduced characters.
Only have the Melee characters and such.
And I was wondering how they do that.
For instance:

So I can try to get my Characters I want to use in there.
That way also, if I get a BrawlEX pack. I can get characters from there I want. As well. Without worries.

I merely want my Shadow, Tails, Knuckles, maybe get a way to get in Blaze over a different Marth. But with a working Voice pack that doesn't mess with Marth. Sonic, Metal Sonic, Dark Sonic. Toon Link, Link, peach, IC's.
A few more.

But without worries of having all the other useless characters in there.

How do you do it?

[DTST]

By editing the CSS.dat

[Ҩᴜᴇᴇɴ]

How do you do that?
I figured it was something along those lines.