You can convert groups to linked Revit models, and you can convert linked Revit models to groups.
It is recommended that you use groups when there is significant geometrical interactivity in a model (for example, joins, inserts, or references) and where project standards need to be managed in one location.
Sample scenarios where you would use groups are hotel rooms, apartments, and repeating floors.
Switching between groups and links may be useful in the following scenarios:
Your model contains multiple groups of repeating elements that exist as linked Revit models. As you work in the main model, you can convert the linked models to groups to make edits. This allows you to make edits to linked models in context of the main model. When you finish modifying the group, you can convert it back to a link.
You have created a group or linked Revit model, and then decide that you need to change the group to a linked model, or change the linked model to a group.
When you convert a group to a linked Revit model, any excluded elements are restored in the link. For more information about excluded elements
CONVERTING GROUPS TO LINKED REVIT MODELS
In the drawing area, select the group.
Click Modify > Model Groups tab > Group panel (Link).
In the Convert to Link dialog, select one of the following:
Replace with a new project file:
Creates a new Revit model. When you select this option, the Save Group dialog opens. Navigate to the location where you want to save the file.
If you want the new link to have the same name as the group, leave the default name, otherwise enter a name for the link, and click Save.
Replace with an existing project file:
Replaces the group with an existing Revit model. When you select this option, the Open dialog opens. Navigate to the location of the Revit file you want to use, and click Open.
If there is a linked Revit model in the project with the same name as the group, a message displays to indicate this. You can do one of the following:
Click Yes to replace the file.
Click No to save the file with a new name. The Save As dialog opens, where you can enter a new name for the linked Revit model.
Click Cancel to cancel the conversion.
CONVERTING LINKED REVIT MODELS TO GROUPS
In the drawing area, select the linked Revit model.
Click Modify > RVT Links tab > Link panel (Bind Link).
In the Bind Link Options dialog, select the elements and datum to include in the group, and click OK.
If there is a group in the project with the same name as the linked Revit model, a message displays to indicate this. You can do one of the following:
Click Yes to replace the group.
Click No to save the group with a new name. Another message displays indicating that all instances of the linked model will be deleted from the project, but the linked model file will still be loaded in the project. You can remove the linked file from the project by clicking Remove Link in the message dialog, or you can remove it at a later time from the Manage Links dialog.
Click Cancel to cancel the conversion.