Make check box visible only if a specific option is checked

Are you comfortable with VBA?

Say checkbox1 is your 'control' and checkbox4 and checkbox5 are your 'variables', you could use:

If me.checkbox1=true Then
me.checkbox4.enabled = True
me.checkbox4.enabled = True
else
end if

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It is hard to say without verifying the source.

Thanks... unfortunately I am not that familiar with VBA. Can I put that code in an event for "After update"

Sorry... I am an idiot at this.

In most cases, you need to include BOTH sides of the condition.

If Me.fraSelection = 1 Then
    Me.chkFld1.Visible = True
    Me.chkFld2.Visible = True
Else
    Me.chkFld1.Visible = False
    Me.chkFld2.Visible = False
End If

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Note that you need to check the value of the option group, NOT individual controls inside the option frame.

If you go with the macro (I don't think it is easier and I never use them), add the false option there.