The first step would be to see what are the process changes that have taken place. You need to draw a DFD (data/process flow diagram) for that.
Once you draw the PFD you can explain the process step by step.
I am appending a document, which might help to some extend. 6th August 2013 From India, Delhi
Yes, you can create manuals for each sub-process. For example: Manual for hiring, on boarding, induction, training and development and all the HR processes. Please see appended a sample. 6th August 2013 From India, Delhi
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