• For IRCC intents and purposes, you will have to fill a personal history where you should inform past occupations for the last 10 years to the date of application. That would obviously include your most recent occupation with the new NOC code.
• Now for the work history, you can choose what occupation you'll claim points for. In your case, claiming points for those 7 years will do just fine since it is way more than the necessary 3 years of experience outside of Canada.
Note that if your work experience was in Canada, you could even claim points specifically for that new position if you wanted to.
In any case, you can always write an explanation letter with concise words stating what experience you are claiming and stating that you do only have proof of work for the 7 years of NOC code 1111.
• Now for the work history, you can choose what occupation you'll claim points for. In your case, claiming points for those 7 years will do just fine since it is way more than the necessary 3 years of experience outside of Canada.
Note that if your work experience was in Canada, you could even claim points specifically for that new position if you wanted to.
In any case, you can always write an explanation letter with concise words stating what experience you are claiming and stating that you do only have proof of work for the 7 years of NOC code 1111.