I am programming a C# Windows Forms application in .NET8.0.
I have a report where I need to show gas concentration readings by time and by gas type.
So each row will be an hour of the day (1...2...3...) and each column will be whatever number of gas types the user selects.
Like this:

This is easy, I pull the data from my database and fill a CrossTab with the DateTime and GasName information.
What I need now is an extra column on the far right side to display the Operational Mode, like the "Total" column we have by default that sums up the values in that row.
Each gas type has its own operational mode but in this column I only display the most important mode, following a pre-set priority list.
Like this:

I was able to do it in Microsoft SQL Server Report Builder using Tablix, I just insert one column to the right and write my expression.
How can I do that in Stimulsoft?
Thank you!