The categories in Organizer can help manage the amount of work for a project by breaking down the assemblies by phase and assembly type. This can help in estimating the amount of work required to detail and/or fabricate the project even before the model has been detailed.

1. To open Organizer, click Manage on the ribbon and then click Organizer.
2. Create a new custom category, right-click the category and select Properties. Enter Assemblies by phase as the name of the category.
3. Define the properties of the category as follows:
   1. Ensure that the Include the highest assembly level in the model checkbox is selected.
   2. Under Automated object content, click the Select model list and select the Tekla Structures model to avoid getting any reference model assemblies to the category.
   3. Ensure that the Update category at synchronization checkbox is selected.
   4. Select the Erection property template from the Property template list.
   5. Click Modify.

      The steel assemblies in the model are now added to the category and their erection information is shown in Object Browser.

4. Next, click in Object Browser and select Group:
   1. Drag the Phase (or Phase Name) column to the grouping row.
   2. Drag the Name column to the grouping row.

   You can further group by any additional properties you would like to use to break down the work of each phase.

5. Right-click the Assemblies by phase category and select Create automated subcategories.
6. Click Grouping in Object Browser.
7. Click Modify.

   You now have the Assemblies by phase category broken down into subcategories by phase, then by name.