There's been several topics on reading Civil 3D Property Sets on the FME forum, and according to the release notes for FME 2019.1 support seems to have been silently added:
-------------------------- FME 2019.1 b19527 20190309 --------------------------
Civil 3D: Added read support for property sets [FMEENGINE-10155]
-------------------------- FME 2019.1 b19540 20190327 --------------------------
Civil3D: Read property sets from CAD entities as well as Civil entities [FMEENGINE-10155]
However I'm having trouble in getting it to work in a reliable manner and there doesn't seem to be any documentation of the extent of the support.
Above are some of the attributes from our Property Sets. NV-Corridor are automatically assigned by Naviate and all of the information from that plugin works fine. BIP are attributes that we define ourselves with Property Sets. The ones that showup in the Property list in FME and that I'm able to read in the workspace seem to be limited to plain text Properties in the Property set. Whereas the bulk of the information we add use some sort of formula, these are nowhere to be found.
Is this a bug? A limitation in the current implementation of the Property Set reader? Or am I missing something in my current configuration?