I want to allow editing of specific range to specific gmail id. For example A1 contains gmail id of Tom and I want to allow Tom to edit B1 to G1, and A2 contains gmail id of James and I want to allow James to edit B2 to G2. How Should I do that. There are 400 different gmail id of different persons I want to allow them to edit specific ranges according to the gmail id present in column A. How should I do that. Manually doing this is very time consuming.