I'm not sure I understand what you are asking.
Do you mean that if the checkbox group has a value of 3 then you want checkbox number 3 on your report to be shown as ticked? Where does the related text box come into it?
If I'm on the right lines then you can put the following in the control source for checkbox 1 on you report:
=IIf([myValue]=1,True,False)
And in checkbox 2:
=IIf([myValue]=2,True,False)
etc
myValue can refer to any other report field so if it's text then:
=IIf([myText]="the text corresponding to 1",True,False)
etc
hth
Stopher