[Mauiusers] How to set Group and Class/Queue?

[=?gb2312?B?yM7R5cHB?=]

Dear every body:
    my machine have following set:
    GROUP:  USERS GUEST
    CLASS/QUEUE:  DELL RCMM DAWN
now, usera is belong to group GUEST, and userb is belong to group USERS, I want to
limite that usera in Group GUEST only can submit the job to class/queue RCMM,
while userb in group USERS can submit the job the all class/queue (DEL RCMM DAWN),
how I can set in maui.cfg

Best Regard!