For a large amount of information it sounds like the above is the way to go.

For an individual person look at their page and in the row that has search records, print etc. there is "more options". That brings down a menu which has "save person to another tree".

Be careful using this. It has some quirks to it. It doesn't save everything exactly. It doesn't get all the sources, etc. You may end up with an ancestry tree. It would be your own tree but at a casual glance would look like any other listing of trees. Also right now I can't get it to work for me. It has worked for years until about Feb 18th. Hopefully it will work for you.