You can copy a linked model to create multiple instances in the host model.
For example, in the following image, building 2 and building 3 are copies of the same linked model.

To copy a linked model to another project file
- Open the project file that contains the link to copy, and open the file to copy it into.
- Select the linked model in the drawing area.
- Click Modify | RVT Links tab
Clipboard panel
(Copy to Clipboard).
- Click View tab
Windows panel
Switch Windows drop-down, and select the project name to copy the linked model into.
- Click Modify tab
Clipboard panel
Paste drop-down
(Paste from Clipboard).
- Click in the drawing area to place the linked model.
- Click Edit Pasted panel
(Finish) to complete the paste operation.
If you want to edit the pasted linked model, click Edit Pasted Elements. See Editing Pasted Elements.