The objective of this study were; 1) to study of appropriate forecasting techniques for each inventory model 2) to forecast sale volume in each inventory 3) to use the data from the forecasting to be a guideline for planning each list of purchasing order by using Minitab analyzing and forecasting program with 5 Time Series Forecasting Techniques; 1) Decomposition 2) Moving Average 3) Single Exponential Smoothing 4) Double Exponential Smoothing 5) Winters’ Method and comparing each forecasting technique by using Mean Absolute Percentage Error (MAPE) to find out the appropriate one.