# External References \[PIG]

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.


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# Agent Instructions: Querying This Documentation

If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter:

```
GET https://docs.openbrim.org/templates/precast-i-girder-bridge-workflow/external-references-pig.md?ask=<question>
```

The question should be specific, self-contained, and written in natural language.
The response will contain a direct answer to the question and relevant excerpts and sources from the documentation.

Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.