Me : Creating training content is a headache 

Myself : Hmmm… 

Me : Do you have any short cut to that? 

Myself : There is no short cut to success, and there is no short cut to building quality content.

One of the efficient ways though can be straight away looking for standard operating procedures which are actually used 100% while performing the work. They can be in the form of Process Flow Diagram, Work Instructions for performing a task, check Lists to ensure that work instructions are followed, Escalation Process Documents etc. You should look for such documents and use them for building your training content.