Customize the rebar catalog
The rebar catalog contains definitions for different reinforcement types, such as reinforcing bars and strands of different grades.
The rebar catalog shows standard, environment-specific reinforcing bars and strands of the environment (or environments) that you have installed and that is currently open. The blank project environment only contains undefined reinforcing bars and strands.
Tekla Structures stores the rebar catalog information in the rebar_database.inp file that is by default saved to the current model folder.