Select Continuous by Discrete from the Graphs - Graphs of Input Data - 2D/3D Histogram by menu to plot a continuous variable (the currently highlighted variable) against a discrete variable in a bivariate histogram. The values of the first variable will be categorized according to the STATISTICA automatic categorization conventions (described in 3D Histograms by - Continuous by Continuous); however, you will be given the option to specify the codes for the discrete variable in the Select Codes dialog.