hi !
coordinates in dxf files are never interpreted as degrees, even though if you import them into a scene which has a defined projection.
if you have 48 / -123 degrees approximately, the effective cartesian coordinates you need are much bigger.
if you have any GIS data, you can check those values by selecting 1 shape vertex or graph node and then in the Inspector check the vertices tab for the xyz values. note that those values are always cartesian (xz horizontal) and yUp, not as in GIS where you have xy horizontal and zUp.
you will find large coordinates such as e.g. 300'000 / -850'000 or so. Thus, you have to move your dxf data to those coordinate positions in your CAD/drawing application.
Once your data is at the correct cartesian coordinates, on the CityEngine IMPORT (into the scene), those big values are reprojected using the projection and will land around 48/ -123.
I'm currently on holiday. If this helps ok, otherwise, we can check if we find a time to chat.
cheers !
matt