Hi,
I can't access the online EOI form because I'm not registered so I can't check out what they are asking for.
I would think, if you are claiming points for all your work experience, you should show each job separately in case INZ asks for evidence or similar. If you showed it all as one job it wouldn't be strictly true unless they ask for total work experience. Those are only my thoughts so perhaps someone who has completed the same form can help you out on this.
Have you read through the
EOI guide ? It talks about work experience at the bottom of page 27 and into page 28. I don't know if there would be anything in there to help answer your question.