Graph > Bar Chart > choose Bars represent: Counts of unique values > choose Stack > OK
Use to chart counts of unique values, clustered/stacked by grouping variables.
Categorical variables (2-4, outermost first): Enter two to four columns of categorical data. Minitab displays all groups on the same graph. The first variable is outermost on the scale, and the last variable is innermost (stacked). (To panel by one or more variables, use By Variables.)
Stack categories of last categorical variable: Check to stack the categories for the last categorical variable. Each category is represented by a separate segment of a bar.