You can go to Plot>Multi-Panel/Axis>Multiple Panels by Label. Uncheck Auto for Number of Rows and Columns to designate 4 rows and 2 columns. Alternatively, you can plot separately and then merge the graphs. Then go to Graph>Arrange Layers... to arrange the merged graphs in a 4x2 configuration.
You can go to Plot>Multi-Panel/Axis>Multiple Panels by Label. Uncheck Auto for Number of Rows and Columns to designate 4 rows and 2 columns. Alternatively, you can plot separately and then merge the graphs. Then go to Graph>Arrange Layers... to arrange the merged graphs in a 4x2 configuration.