Thank you for your very informative answers.If you are the primary applicant, than for your spouse you don't have to mention work experience in work history section.
Reason: You dont get any points for spouse work experience, so why bother for reference letters etc.
Just mention all of your spouse work experiences in personal history section truthfully.
My wife is the main applicant, so I guess I will not fill any job experience for myself when creating our profile. I know many couples who were in the same situation but they all filled all their experiences during the creation of their profiles and they struggled to find all the documentation to prove everything, I really do not understand why they did like that, maybe they did not want to take the risk. Anyway, I will do as you advised me and only fill the last experience of my wife, all my experiences and her other experiences will be mentionned in personal history section.
Thank you again,