A typical cross-section plot uses a Cut Line 2D data set (which you add in the Data Sets branch), which defines a straight line (or set of parallel lines) in a 2D geometry, and a Line Graph in a 1D Plot Group, which uses the Cut Line 2D data set as its data input. You can use the same Cut Line data set for multiple cross-section plots of various quantities along the line that the data set defines, and you can create several Cut Line data sets to plot quantities along different lines of interest.