(1) Explain your problem, don't simply post "This isn't working". What were you doing when you faced the problem? What have you tried to resolve - did you look for a solution using "Search" ? Has it happened just once or several times?
(2) It's also good to get feedback when a solution is found, return to the original post to explain how it was resolved so that more people can also use the results.
Hi Rod,
Yes, you are correct. The selected items are activity-related and will be automatically deleted if they are not found in the new record import and it works on me.
Another option you can choose is to use the 'Replace Existing Project' import action instead of selecting 'Update existing Project'. This will provide an exact copy of the imported Project.
Please Note: this import action will delete the whole copy of existing project including the baseline.