Referencing one project in another

I know Kicad is not meant for general electric schematics, but so is Orcad, and I am trying to do something I used to do with Orcad Capture.
Lets say I have Project1 for a certain PCB and Project2 for another PCB (both are hierarchical projects and contain several schematics).
Now I want to create Project3, which is not a PCB- it is an assembly that contains some components, as well as the PCBs Project1 and Project2.
Is there any way to display the top level of Project1/2 in Project3?
In Orcad it is possible since the whole design and it hierarchal sheets are in one DSN file and you can create a hierarchical sheet that points to a different project DSN file.
Is this possible in Kicad?