If you do not want to use direct modification to modify a reinforcement, you can use, for example, the reinforcement handles to modify the reinforcement.
Tekla Structures uses handles to indicate:
The ends and corners of a reinforcing bar.
The distribution length of a bar group.
The corners and main bar direction of a mesh.
When you select a reinforcement, Tekla Structures highlights the handles. The handle of the first end point is yellow, the rest are magenta.