Dissolve Assemblies
This tool allows you to dissolve the hierarchical relation between two or more parts.
Select one or more assemblies
Under Modify, click Assembly and then click Dissolve Assemblies
The selected assemblies will now be dissolved. If you dissolve an assembly with multiple levels, only the top level of the assembly will be dissolved.

If you dissolve a subassembly within an assembly, the resulting dissolved parts will still be part of the top level assembly.

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