If I understand you correctly, yes.
Two ways:-
1. There is a single line of data (The Tool Bar) at the top of the Sierra screen underneath File, Edit, Chart etc. This contains the OHLCV and OI data for the currently selected chart.
2. Sierra has a built-in spreadsheet facity. You set up a spreadsheet for a particular chart and O,H,L,C,V, and OI are transferred in.
You can then perform your own calcs on the data and plot your own indicators using your calcs.
Example
If you create a spreadsheet for a 1 minute real-time chart, the data in the top data line of the spreadsheet is the current 'minute' data and is changing until the minute is finished.
That data is then shifted down a row and a new minutes worth of data is created an updated in the top line ss the next minute ticks by.
So you get columns for O,H,L,C etc, with rows of data underneath shifting down every minute.
Sierra also links to Excel and does the same thing, but you then have more tools to use if you need them.
Glenn