The Box and Whisker charts are part of the QCChart2D charting software and do not have any of SPC Control chart characteristics (found in QCSPCChart) such as control and spec limits.
Is there a way to apply control limits to more than one point on the same line in an SPC Control chart and if so are there any examples provided for such a scenario? In my case I may need to apply a different limit to each point. If it's unclear, what I want to be able to do is have 2 measurements for the same lot displayed.
If you talking about applying two different sets of control limits to a single sample interval (which may have one or more data points, depending on the chart type and the number of samples per sample interval), the answer is no.