is it possible that this is imported geometry? Its possible that these are surface bodies and not design bodies.
IF this is so, you can toggle from construction to design at the part level (prefered method) ... and/ or show surfaces at the assy level.
However, I too have seen instances where it just seems like something will not display the way one would expect. in such cases, active those parts and run the update all on the assy to see if that helps.
Matt Johnson Solid Edge Certified Professional (ST7 & ST8) Solid Edge ST9 (SEEC) - Production SE2019 Pre-Production Testing NX11 (Tc Integration) Pre-Production Testing Teamcenter 10.1.7
Thanks for the suggestion. Actually all the steps you mention is quite helpful. But after all the trial at last I found the solution due to the occurrence properties setting. Don't know why by default it hide the part in subassembly. Anyhow thanks for the great helps!!