Export PSLIST TO Navisworks

It seems it is a physical element and part of pipe; Whether you exported a pipe which contain PLIST?

When you export a pipe, these elements should appear automatically.

This is my hierarchy.

I have exported pipe but i haven't the PSLIST. 

did u check ur naviswork either it show compact or standard?

if compact it will not show the list, choose standard.

by default the list should be available