You have to demonstrate that you have sufficient work experience. It is a good idea to submit as many as you can. When you complete Form 80 you have to list your entire list of employment and unemployment since the day you were born.
Hi. Could you confirm my understanding that a person who is on BVC 030 granted against 457 visa application (and had been a 457 visa holder) can now apply for 186 or 187 visa under TRT (or even under D/E, if has positive skill assessment), following the amendment of Migration Regulation 1994 on 13 April 2018 [ref: 5.19(5)(e)(iv) to (vi)], and this option was not available earlier. Besides, please inform if a person whose 457 was granted on a metro postcode can apply for 187 TRT if employers main office and business is in regional area and the visa applicant had worked in the regional office most of the 4-year visa period (as the PD submitted in the actual 457 nomination and visa application provided that the incumbent is required to work on other sites ...) Will appreciate your prompt reply, if you could please