> For the complete documentation index, see [llms.txt](https://docs.openbrim.org/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.openbrim.org/templates/cable-stayed-bridge-workflow/external-references-csb.md).

# External References \[CSB]

To generate a child model from a master model (or, based on the terminology, a local model from a global model), or to combine several projects within a single project, this section of the workflow can be utilized. For detailed guidance, refer to the relevant section in the documentation: [page.](https://openbrim.atlassian.net/wiki/spaces/OBrIM/pages/2803269633/Creating+a+Local+Substructure+Model+for+Soil-Structure+Interaction+from+a+Global+Model+QG-15#Setting-Up-the-Local-Substructure-Model-Using-Data-from-the-Global-Model)

By utilizing **External References**, users can:

**Project 3D**

* Combine multiple bridges into a single model or consolidate reports related to a bridge (such as quantity take-off, code check reports, and load rating reports) along with the associated 3D model within a different project.

**Project Objects**

* Merge multiple bridges (both 3D and FEM) using project objects, allowing for data manipulation as needed. *Use case: Tub Girder and I Girder sharing the same substructure element.*
* Extract specific bridge elements (both 3D and FEM) and transfer them into a separate project. *Use case: Enhance the substructure design without manipulating the master/global model.*

**Project Analysis Results**

* Utilize **Project Analysis Results** to replicate loads applied in a global/master model, enabling the independent analysis of elements under the same loading conditions and using identical definitions as in the global/master model.

**Imported Data**

* Data authored in another system and brought into this project, such as a survey surface exported from a civil design package. Unlike the items above, it does not stay linked to a master model: the project keeps its own copy, together with the file it was imported from.


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