Thank you, txnelson.
Need extra seperate two group by Month like below.
It looks the control chart builder-XBar can use 'Phase' to seperate this two groups in chart,
and have respective mean line(green) in chart.
I would like to draw the same at Graphic builder since it's more flexible to add extra charts and informations.
![Chily_2-1666849217871.png Chily_2-1666849217871.png](https://community.jmp.com/t5/image/serverpage/image-id/46618iCB9556C5E3ED8287/image-size/medium?v=v2&px=400)