There is a way to make the OS X clipboard hold more than one “thing” at a time. The clipboard won’t work that way on its own, but if you install one of the aftermarket clipboards, you might be able to work better because you’ll be able to keep many more “things” on the clipboard and select from them in order to paste into a document.
One of the aftermarket clipboards I use is called Jumpcut, and it can hold up to 99 chunks of text. Each time you cut or copy, the text goes into Jumpcut’s clipboard que, and you can select whichever chunk you want to paste by going to the Jumpcut icon on the menubar. Select what you want to paste, and Jumpcut pastes it for you.
So that way you can que up lots of text bits and pieces and work with them the way you want. You can select how many bits you want to appear in the menu, too; you don’t have to max Jumpcut out to 99. You can download Jumpcut here.
Once you doubleclick the Jumpcut cion, it starts up and will appear in your menubar. From there, look at Preferences to set how many items you want to appear in the menu. If you find you use Jumpcut all the time, drag its icon to the Login Items part of your Account in System Preferences. That way, Jumpcut will start up each time on its own when you start your Mac.
You might also want to read the article 10 Clipboard Managers for OS X, which covers other clipboard managers. They all do something a little different, and you might find a better fit for your kind of work methods.