The objective of this manual is to provide supplementary guidelines to seed companies during maintenance of parental inbred lines, seed production, handling and storage of herbicide resistant maize varieties. This manual should be used as a companion to the Maize Hybrid Seed Production Manual by MacRobert et al. (2014), published by the International Maize and Wheat Improvement Center (CIMMYT). The manual is available at http://repository.cimmyt.org/xmlui/handle/10883/4026?localeattribute=en. The main hybrid seed production manual contains detailed information on hybrid composition, seed classes, planning seed production requirements, pre-basic, basic, and certified seed production, field management of hybrid seed production, and seed crop budget. Seed companies are strongly advised to consult the manual for detailed information on managing maize hybrid seed production.17 pages