For example -
Code:
ConVar cvar1, cvar3, cvar4;
public OnPluginStart()
{
cvar1 = CreateConVar( "sm_cvar1", "1", "ConVar description for cvar 1..." );
cvar3 = CreateConVar( "sm_cvar3", "3.5", "ConVar description for cvar 3..." );
cvar4 = CreateConVar( "sm_cvar4", "Ciao", "ConVar description for cvar 4..." );
AutoExecConfigAppend("ConfigName");
}