It would appear on the surface that the Pierre Julien you have with the same exact birth date of Pierre-Rene Julien in this profile is the same person and any additional profile would eventually get merged. However, the possibility exists that this Pierre married twice. The existing children in the current profile (with Mary Bullock) have birth dates starting in 1700. The Pierre you have has 8 children and the next to last has a birth year of 1690. Instead of creating a new profile for your Pierre Julian, may I suggest you add a spouse to the current profile and then add the children based on your documentation.