The purpose of this study was to present a management model for stocker-finishing cattle systems through modeling and simulation results from intervening the different levels of intensification, serving as a Decision Support System (DSS) for ranchers. Model was developed and operated in Microsoft Excel spreadsheets, with data collected in the field and literature reviews. The system allows to individually manipulated the animal feeding in the herd throughout the production cycle. This approach will measure the results quantitatively, through the existing stocking rate, and qualitative, through the daily weight gain from each diet administered to animals. DDS spreadsheets support the individual management for up to 500 animals in a period of analysis of maximum 53 mo. The model is operated in a single spreadsheet, divided into 3 components: Feeding Systems; Animal Performance; and Summary & Economic Analysis, being all levels interconnected. Model validation was simulated based on the Pasture-Based System (PBS) within 2 situations: Pasture/Feedlot-Based System for Finishing Cattle (FBSF) and Pasture/Feedlot-Based System for Stocker Cattle (FBSS). There was an increase in productivity for FBSF and FBSS (321 and 314 kg/hectare/year, respectively) and a decrease in slaughter age (21 and 23 mo, respectively) compared with PBS, 274 kg/hectare/year and 26 mo (P < 0.05). In the economic analysis, PBS (119.23 U$) showed higher annual gross margin per hectare, followed by FBSF (79.65 U$) and FBSS (57.25 U$) (P < 0.05). The model provides an overview of integrated management, showing major results during herd’s feeding, purchase and selling prices, and animal performance of stocker-finishing systems in beef cattle production. The intensification observed in our study decreases the economic return in the evaluated system. Intensification is not indicated regarding biological and economic parameters used in this simulation. Scenario studies simulating purchase and selling prices, costs and another management interventions are necessary to better support the decision making process.