Check with your health professions advisor about the committee process for more specific information, but I'll tell you how my committee letter went. I had four people write LOR's (2 prof, 1 dentist, 1 personal). I submitted those to the health professions committee along with my personal statement and signed up for an interview date. The committee interviewed me and gave me very helpful feedback about my interview. They also gave me a questionnairre that I filled out and brought to the interview (it had information about EC's, GPA, DAT, etc.). The committee then, based on the interview, personal statement, questionnairre, and other LORs, wrote a separate letter of recommendation and attached the other LORs (that I had previously submitted) to it. So all of the letters got sent. I'm not sure if this is how all committee letters work, but this was my experience.