Xbar and Rbar, phase 1 and 2

[Jweinstein2001]

Within my classroom, we are currently engaged in a project. Unfortunately, this is only a statistics class and not coding, and I have a question about how SAS works. I know how to properly create an xbar and r chart that correspond with one another. Yet I was wondering how do I then add a second group of data which is my phase 2 on an already existing control chart with preset limits from phase one data?

[PaigeMiller]

See this example of using PROC SHEWHART with multiple phases

https://documentation.sas.com/doc/en/pgmsascdc/9.4_3.4/qcug/qcug_shewhart_sect500.htm