Alan,
What would make this process easier would be the ability to set a prefix and layer group to lines imported from a pdf. This would help us organize the lineworks data from the pdfs. Linework imported from a pdf is not tied to the pdf, so if you already have a pdf imported into the project it can be a nuisance to separate data.
Yes you can select newly imported vector linework from a pdf, export it out as a dwg/dxf, re-import and set a prefix but this is a lot of extra steps that should be available. This is especially a pain for revisions. Using the pdf over the CAD file is sometimes quicker because you just need to bump out the curb, move a sign, make small adjustments or tweaks. It doesn't always warrant going through the whole CAD file and you may miss something going this route.
Things that would help the current process until pdf vector snapping is implemented:
1. Option to set a prefix to imported layers
2. Option to set a layer group
3. Have the lines imported from a vector pdf be tied to the pdf
- This would allow users to select all members
-Useful when a revision comes out, users could grab all and delete