I`m Ansoo from Samsung biologics. To make the strict and intuitive document relationship, we want to use the existing document number for newly created documents. Like, parent document has ABC-0001, then when create child document, we want to leverage parent document number and add sequential numbering, 'ABC-0001.childXX(XX is sequential)'.
This is very useful to track the related documents at one view and end users can easily find the related documents. (for example, procedure document and related forms)