You can copy a parent file with all its references to create a second instance unrelated to the original.
For example, you can copy an assembly file to use as the basis for a new product. Copying a file with references lets you reuse all the related parts and drawings without having to recreate the data.
If you copy, move, or rename a part or assembly, SOLIDWORKS PDM records the new relative location of the associated files when you check them in. This applies to relations between assemblies, subassemblies, drawings, and parts.