The main part in a steel assembly has other parts welded or bolted to it. By default, the main part is not welded or bolted to any other parts. You can change the main part in an assembly.

1. If needed, check what is currently the main part of the assembly.
2. Ensure that theSelect objects in assemblies selection switch is active.
3. On the Steel tab, click Assembly > Set as main object.
4. Select the new main part.

   Tekla Structures changes the main part.