Yes, your locksmith can help you do this. In most cases you can keep your existing locks, and have a locksmith code them alike. This is referred to “Keyed Alike.” An easy test to see if your existing locks can be keyed alike is to see if the one common key will enter the cylinders (keyway) on the other locks.
Generally, if one common key enters all locks, then they can all be “Keyed Alike.” If your locks are not compatible, you may be able to use most of your locks, and need to purchase 1 or 2 to accomplish your goal. Consult with your locksmith; we can help get you on the right track, with a minimum amount of money spent.