Usage of COTMAN software for making decisions is a potentially money saving tool for producers. Use requires investment in time and effort for sampling from four points per forty acre field during the growing season. Points are selected for use with COTMAN that describe average growing conditions in each field. A methodology for using COTMAN with fewer than four sampling points is examined in this study. COTMAN development curves for combinations of points classified as average conditions based on yield maps were compared to curves from all sampling points. The procedure was conducted on fields from Arkansas, Texas, and Tennessee.