In light of recent changes in retail caused by the growth of online shopping in Brazil, this study aims to enable a substantial lead time and a high degree of accuracy of the Omnichannel demand forecast for a retail company. As Omnichannel success continues to expand, it becomes increasingly important tounderstand the needs of both traditional and digital consumers, integrate their experiences and offer multiple purchase channels. In this context, demand forecasting is crucial for identifying market trends, growth opportunities, potentialstrategies and supporting strategic, tactical and operational decisions. The use of Hierarchical Time Series improves forecasts accuracy and, therefore, assists in decision-making, allowing the development of consistent estimations acrossmultiple hierarchical levels. Thus, this study combines the time series forecast generation methodologies ETS, ARIMA and SARIMAX, with Bottom-up, Top-down, MinTrace Optimal Combination (OLS) and MinTrace WLS Struct reconciliation methods, resulting in the generation of twelve models. Based on the main theories of Hierarchical Time Series and following a 7-steps sequence, the models were compared using performance evaluation metrics to identify the best fit for the investigated series. The research concludes that the SARIMAX model,together with the Bottom-up strategy, proves to be the most appropriate composition for the Hierarchical Time Series under analysis, as it demonstrates the best performance across the evaluation metrics, reaching a MAPE of 22 percent at the most aggregated level of the hierarchy and reducing the original company forecasting MAPE by five percentage points.