Dear Rabbi I was just wondering about the following situation. Can several people make hamtozi and say the bracha on the same challah and then the person who made the initial bracha proceed to do the cutting? I have seen this practice before and was just wondering it it is mentioned in halacha.

Shalom uvracha, Thank you for your question, It is a legitimate practice. It is based on the fact that sometimes it is hard for everyone to hear the person who makes the bracha, and it is also hard to have cavana (meaning to have the proper concentration). See piskei Teshuvot (174;6, page 353). All the best