Dissolving a Sub-assembly
You can dissolve a sub-assembly into individual components, thereby moving the components up one level in the assembly hierarchy.
To dissolve a sub-assembly:
In the FeatureManager design tree, right-click the sub-assembly you want to dissolve, and select Dissolve Sub-assembly. You can also select the sub-assembly icon and click Edit, Dissolve Assembly.
The components become components of the immediate parent assembly, and the sub-assembly is removed. The assembly document itself is not deleted from the folder where it is stored.
See Effects of Assembly Structure Editing for effects on mates, component patterns, assembly features, equations, and explode steps.