About Splitting a Harness
A Split harness operation allows you to split any harness into two harness parts. Harnesses are split into dependent or independent harness parts.
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Both dependent and independent harnesses cannot be flattened in a split state. All harnesses must be merged back before flattening.
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Dependent split harness
A dependent harness split creates two continuous harness parts in the same assembly and they share the same split location and cabling information including logical and spools. The original harness part is considered a parent and the new harness part a child that is be identified by a different model tree icon 
When the original harness part and the new dependent harness part are not in the same session some information such as from:to is missing and some cabling parameters cannot be edited. Cables that are routed between the parent and child harnesses appear as complete in the model/cabling tree.
Dependency can be removed at any time by using the Remove Harness Dependency command that is available in the context menu of the harness part.
Independent split harness
An independent split harness creates a new harness part that contains all the needed information to reuse in a different assembly. Unlike dependent split harness, from:to information and split location are not shared.
Independent harness can be created in a new subassembly and all the cabling information from the original harness part will be automatically copied, including spools, logical information and skeleton.
You can restructure all referenced components to the new subassembly to be used independently of the original harness assembly.