You can do this by adding multiple plots to the graph's plots collection and then plotting each matrix on its own plot.  The easiest way to add additinal plots to a graph's plots collection is to right-click on the graph in the dialog editor, click on Properties, click on the Plots tab, and then click the Add button to add additional plots.
Now if you have a member variable for the graph in your dialog class (let's call it m_graph for this example), you could do this:
    // Plot the first matrix
    m_graph.Plots.Item(1).PlotXY(/* Your first 10x100 matrix data */);
    // Plot the second matrix on a different plot, but same graph
    m_graph.Plots.Item(2).PlotXY(/* Your second 10x100 matrix data */);
- Elton