How do I drill holes in cabinet for shelving.

We are remodeling my husbands modular and the cabinets are tall and deep but have no shelving. I'm going to add some pull out baskets on a track and over the door hanging baskets for extra storage but I would like to put in shelves and don't know how to do it with the adjustable pegs. Any advice or other suggestions for these vast useless cabinets?

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