Hello Mykola,
As mentioned in the online help:
The "Non-Code" grid displays the active load case combination set defined for any purpose other than code compliance (e.g. displacement and support results). Any default non-code combination may be modified, deleted or reset and any new user combination created and modified in the same grid.
To answer your question, Yes, T1 load case is based Amb to T1. The default non-code combinations has combinations with a single load cases (i.e. Gravity, Thermal 1, Wind 1..) to be used when reviewing your results for better understanding of the magnitude of multiple load case combination such as GrT1, GrT1+W1, etc...
Recommend to ignore the individual load cases and concentrate on the actual combinations. Again, only to refer to the single load case combinations when trying to understand a combination results.
Regards,
Mike Dattilio
Bentley Technical Support Analyst
Web: selectservices.bentley.com
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