After you have set up a shared coordinate system between the host model and the linked files, the placement of a linked file is determined by its corresponding position in the host model.
You can drag the linked file to another placement inside the host model. When you do this, you are actually changing the corresponding position in the linked file.
When you reposition the linked file to a new position, you can save that change. There are several ways to do this.
After you move the linked file, a warning indicates that the linked file will change. This occurred because you have defined a new placement for the named position in the linked file. In the warning dialog, you can choose to save the linked file or save the new position later by clicking Save Positions in the Manage Links dialog. If you click Save Now, Revit saves the new position to the host model.
Recording a New Location with Manage Links
If you save or close the host model, you are prompted to save the linked models. The Save Modified Linked Model dialog displays.
If you unload a linked model, the Save Modified Linked Model dialog displays. Again, you are prompted to save changes to the linked model.