Importing/exporting kml files

Hi,

I was wondering if someone can test a quick import/export worfklow for me.  I have lots of 3D buildings that come in the form of a KML file.  So, each building has its own KML file & DAE file (Building_1.kml, Building_1.dae).  What I would like is to take all the buildings and merge them into one kml/dae file. 

Can someone try importing the three kml files and then export all three buildings as single kml file?  I have attached 3 example files.  Thank you very much!

Jesse

Bentley_Map_test.zip