I have several columns of numeric data, along with one numeric-continuous datetime column, to the nearest second. I can plot any or all of these by datetime in a time-series to view simultaneously. There is a "group" character-nominal column that in Graph Builder, I can use to separate the analysis by page.
There is another numeric-continuous date column "Event Date" that is to the nearest day (joined from another table) that is matched to each "group" value. There would be one unique Event Date value for a given "group" variable. I would like to automate or script adding reference lines from the "Event Date" column to the x-axis, however with "Allow Ranges", setting the Min Value as the Event Date at 12:00:00AM, and Max Value as the Event Date at 11:59:59 PM based on the "group" column variable, with the intent each "group" would go on a separate page. Below is an example of what it would look like on one page, along with the typical Reference Line dialog box in Axis Settings in Graph Builder for reference:

