Organize parts and assemblies > Rearrange an assembly structure
  
Rearrange an assembly structure
To move an object in the Structure Browser within the structure,
Drag the object to the desired location in the structure.
The following browser objects and elements can be rearranged:
Assemblies
Parts
Containers
Workplanes
Some objects, for example workplane sets, must be directly under the root assembly. Trying to position an object where it does not belong is indicated by the not-allowed symbol.
Additionally, avoid selecting mixed objects in a multi-select (for example, parts and workplanes) and then trying to reposition them. Select and move objects of one type separately.