Details
While executing Simplify Assembly (Menu – Assemblies – Advanced – Simplify Assembly) for top-level assembly with child components, Simplification can't be achieved with the below warning.
"No bodies were created in the simplification part and it has been deleted"
Solution
The components that you select has to have solid bodies displayed.
If the solid bodies are hidden or if the components/sub-assembly you selected do not have the solid bodies, then the message reported will occur,
Hardware/Software Configuration
Platform: INTL64
OS: windows
OS Version: 1064
Product: NX
Application: ASSEMBLIES
Version: V1973
Function: ASSEMBLY_MODEL
Ref: 002-8566903