ok im going to explain this to you, you cant host a CL with codes as codes cant be transferred person to person like that unless the game setup has the files written inside it, like a patch when you join a CL your patch gets infected with the files so you can use them (im not 100% on this kind of stuff but i think im about right, please someone correct me) but i believe you can still host big xp lobbies

use this code on CM or MP :

set ui_mapname "mp_bog;bind button_back say ^3Welcome to An infection Lobby to get infected you have to ^2leave now,go to splitscreen,start fake map,press select and back out go online and you will be 11th;statset 2303 10000000;statset 2301 125490;statset 252 55;statset 2326 11;statset 3000 9;statset 3001 9;statset 3002 9;statset 3003 1;statset 3004 1;statset 3010 7951;statset 3011 7951;statset 3012 16143;statset 3013 7951;statset 3014 7951;statset 3020 16175;statset 3021 7983;statset 3022 7937;statset 3023 7983;statset 3024 7983;statset 3025 7983;statset 3026 7983;statset 3060 16131;statset 3061 7939;statset 3062 7939;statset 3064 7939;statset 3065 7939;statset 3070 16149;statset 3071 7957;statset 3080 7959;statset 3081 7959;statset 3082 16151;statset 2326 11;statset 2301 99999999"