Is 'It is useful to outline the ordering and manufacturing processes on a weekly basis to see how this manufacturer's inventory policies might differ for the two different sizes.' a fitting logical lead-up to 'The manufacturer may sometimes have differing inventory policies for different sizes.'
It is useful to outline the ordering and manufacturing processes on a weekly basis to see how this manufacturer's inventory policies might differ for the two different sizes.###The manufacturer may sometimes have differing inventory policies for different sizes.