It looks like that the City Sample can not be easily ported into other projects.
Why City Sample can not be easily adopted into other projects
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Extensive C++ code, encompassing the entire project (/Source/CitySample)
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Houdini and Houdini Engine license to generate own cities Houdini Store | SideFX
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It appears that the project has only code for single player.
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The Merger Tool does not work properly on the majority of buildings. The buildings which can be properly merged however, lack details on the ground/street floor - which may be overcome by manually setting up the street parts of buildings.
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There are dozens of additional maps hidden inside the Buildings folder, containing Houdini buildings, and assembled meshes - another starting point for assembling buildings manually.
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Another major difficulty - with UE4 it was possible to drag and drop content between different projects, with UE5 this no longer seems to work (perhaps due to the C++ code involved in the Matrix project)
Related
City Sample likely uses 128 SRV (Shaders) UE4.26 - Shader is using too many SRVs (only 64 supported) - #11 by Haoris