I want to copy forest object from one file to another, but have it uses the same surface and geometry from the new file without duplicating them.
1. Let say this is my file.

2. This is my colleague's file that he made a new forest object that needs to be merged to my scene, but he created the forest using the same Surface and Geometry as mine.

3. I merge the forest from another file by 'Merge file > check on Display Influences and Select Influences' this will comes up.

4.1 Selecting Merge, Auto-Rename will get this result

4.2 Selecting Delete Old, I lose my original surface and some of the source object and that leads to losing one of my other forest object.

4.3 Selecting skip, the new forest won't generate.

Is there a way to copy the forest object to another file and have it link to the surface and geometry with the same name?