The spread merge window is a great new tool to combine 2 spreads together.   This is great if you have 2 spreads that you’d like to see how they work in combo.  The spreads must have matching ticker symbols, and just check each spread you’d like to combine with the check box.  The above graph is an example and press merge and presto you have merged the spread.   The original portfolio spread is grayed out showing which spread is the base spread.  If the spreads are significantly far apart the bounds will likely not encompass a meaningful amount in the range you are looking for on the graph.  This isn’t a problem however, visit the Modify Bounds section under the Display menu and change the values on the fly.