If I understand you correctly, you do not want to make it so no appointments can be made for certain times but rather to save appointment times for specific types of appointments. You can do the first as described by Wendell but the only way to do the latter is to teach your staff, the same way you have to teach them that a complete exam requires an hour while a sore throat is only 15 minutes.
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L. Strouse, M.D.
Solo Internal Medicine
Southern Indiana