If I am trying to get my felonies expunged and I receive a misdemeanor will I have to start the process all over?

In Missouri, if the felony you want to get expunged is one of the felonies that qualify for expungement, you have to wait 20 years from the date of conviction before you can file a petition for expungement. During that 20 years, you can't have any other misdemeanors or felonies. So, if you received a misdemeanor during that time, you would have to start all over with the 20-year time period.