If you are talking about Combat Training, yes you can, just go to Combat Training under Xbox Live and go to Create a class.
You may create your own class in call of duty, by entering the main menu of Call of Duty 4 Multiplayer. Then you click the title showing 'create a class'.
You can buy things in Create a class and playercard.
you cant :\
you can't
go to create a class once you are a high enough level equip it as your secondary weapon
first you have to get to level four,then you go to a button that says create-a-class
Yes when you do prestige mode it restarts your create a class and your weapons.
yes you can
dno
You go to "Create A Class" Then Primary or Secondary weapons to choose your weapon then after u edit your weapon.
you unlock create a class at level 4, from there you can simply select it from the first online page in multiplayer.
You must be in the barracks.