When you link a model that contains other linked models, the links become nested.
You can show or hide nested linked models in the host model. The nested links display according to their Reference Type setting in the parent model:
- Overlay does not load nested models into the host model, so they do not display in the project.
- Attachment loads nested linked models in the host model and displays them in the project.
The following image shows that Project A is linked into Project B (so Project B is the parent model for Project A). The Reference Type setting for Project A is set to Overlay within its parent model (Project B). When Project B is imported into Project C, Project A does not display.
If you change the Reference Type setting for Project A (within its parent model, Project B) to Attachment, when you import Project B into Project C, the nested link (Project A) displays.
Nested links that are visible in the project display in the Revit Links branch of the Project Browser under their parent link. Nested links do not display in the Manage Links dialog. (See Manage Links Dialog.)