[Mark_Samp]

here this this :

PHP код:

if(strcmp(cmdtext, "/sit", true) == 0)
    {
        ApplyAnimation(playerid,"INT_OFFICE","OFF_Sit_Type_Loop", 4.0, 1, 0, 0, 0, 0);
        return 1;
    } 


Not Tested
Tell me if it worked