Update Target - New Activities

Apologies if this is a bit basic, I’ve only been using P3 "in anger" for 3mths and did the training about 2yrs ago now........

I have entered new activities in the current schedule and am trying to use the tools/project utilities/targets to update these into the target schedule.

However it does not seem to work.

I have made sure that both schedules are exclusive use. The target is closed when I try to do the update (otherwise it tells me it’s open). I click the for activities not in the target....and replace activity titles......

What am I missing? Do I have to go into the target and then do something else in there? I did notice that my target is now rescheduled from May to June 06 (same date as current), does this affect the target schedule, how do I stop that from happening?

Thanks!