Definitely expose all comb before cutting. Start at bottom, cut to brood. Cut up both sides, in until you reach brood. Cut across top down to top of brood.
Last, cut out all brood other than two combs a foot long, side by side.
Wait 1/2 to 1 hour to determine if they are traveling toward the box. If not, the queen will return to the two combs.
If you find the queen and capture her, the two brood combs don't need to be left.