Use the Number modified objects command to number all parts that have been created or modified since the last numberingprocess of assigning position numbers to parts, cast units, assemblies, or reinforcement
In Tekla Structures, the position numbers assigned in the numbering are shown in marks and templates, for example.
. If this is the first time you run numbering for this model, all parts in the model are new and will therefore be numbered.
To number new and modified parts:
On the Drawings & reports tab, click Perform numbering > Number modified objects.