From QlikView Reference Manual (page 641):
A maximum of two dimensions can be shown on the x-axis.
l A third dimension can be shown with multicolored stacked bars.
l Only table charts can display more than three dimensions.
l When two or more expressions are enabled, the two first dimensions are shown on
the x-axis and the expression with multicolored stacked bars.
I hope this answers your question.
qlikview only support to dimensions in grouped mode
you can use a pivot table as a chart see attach example
the only thing it means your chart will always be vertical
look at the attachment
Example.qvw 155.0 K