If you already have an ECA report on your WES account, you need to upgrade it, you will receive a new reference number after you make the payment and there will be specific instructions on what to do for an upgrade application, just follow them.Point 1 and 3 clear
For point 2, should I enter all my previous certificates and degree in the WES online application or just the new credential ?
Even if you request it, they will not do it and insist on sending previous documents again. No point doing this and risking delay of the process, just do as they have asked and send the documents again.Request for an update for your profile and you will be given a reference number to add additional documents. You don’t need to start all over again