Activate major changes in perspective project

Hi,

I rolled out a perspective project for several clients which is now being used on daily basis.
Now I am facing the challenge that there has been a good idea for a change which I know how to implement. But the changes won't be done within an hour and it might be needed that I would need to continue on the next day. But all changes would be pushed out as soon as I save the project, wont they?

So I am wondering if I am missing a feature which would allow me to finish the whole change before having it activated with the users.