I have some components wrongly created in some child publications. I would like to move these components to parent publication with out breaking the dependencies in the pages.
Do we have any power tool doing the same job.
To do this you would have to use the content porter tool.
Export your content from the cms, when importing you can manage the mapping of the publications.
I've personally had trouble with it in the past so I typically modify the package to change the WebDAV paths for the dependencies. Do so with extreme caution though :)
Be aware that if the child components exist you may need to be moved or removed before you import.
UPDATE: There is also an old powertool that let you copy / move items from one publication to another, i'd recommend checking it out, you may need to do some work to get the tool working in 2011.