Primary price bar time series are those whose data make up the primary price bars, i.e. the main set of price bars on which your strategy runs.
Examples of primary price bar time series are the data series representing the open, high, low, and close prices, the trade volumes, and the end times of the primary price bars.
To view all numeric primary price bar time series, click on any location in the “When Bar Updates” section where a number or numeric time series is allowed, and open the “Replace Item >> Price Data” context menu folder.
You can view the time series of bar end times by following the same procedure, but clicking instead on a location in the “When Bar Updates” section where “date and time” values or time series of “date and time” values are allowed.
If you have defined any secondary price bar variables, you can find them in the “Secondary Price Bars” folder of the “Replace Item >> Price Data” context menu folder as well.