Assign family numbers

On the Drawings & reports tab, click Numbering settings > Numbering settings to open the Numbering Setup dialog box.
Go to the Family numbering tab.
Define which numbering series to assign family numbers to.
1. Click Add series to open the Add series dialog box.
  
  Tekla Structures displays all the assembly and cast unit numbering series in the model.
2. Select a numbering series from the list, and then click Add.
  
  The numbering series appears in the family numbering list.
Under Compare, select the properties that need to be identical for the members of the same family.

Define comparison criteria for each numbering series separately.

Select at least one check box, but not all of them. If you select all the check boxes, the family number will be the same as the normal assembly position, and the qualifier number will be 1 for all. If you do not select any check boxes, only one family number per series is assigned.
Click Apply.

Tekla Structures stores the settings in the numbering database file (<model_name>.db2) in the current model folder the next time you save the model.
If you are assigning family numbers to parts that have already been numbered, clear the existing numbers.
Update numbering in the model.

Tekla Structures assigns a family number to all objects in the numbering series.