Hi Thomas,
You can Split the y axis two times to create a panel of graphs above this one. That assumes you have the same y-axis for all of them.
This screen shot looks like you may have already split and combined the Y-axis to join onto one graph. In which case, you can also create each group of two graphs separately and then combine them.
If you search the on-line examples for the word ‘combine’, there is a similar example but with three graphs in the y-direction. The left and right side are combined in a graph for composition (File > New Graph > For composition).
Does this help?