iCloud 
Remove documents from iCloud
You can remove documents and other items stored in iCloud by deleting them from any of your devices that have iCloud set up for Documents & Data. Removing your documents from iCloud reduces the amount of iCloud storage space you’re using.
If you use iMovie and want to remove films and trailers stored in iCloud, see the iMovie Help topic about iMovie Theater on iPhone, iPad, or Mac.
WARNING: When you delete items that are stored in iCloud, they are removed from all your devices immediately and permanently.
Remove iCloud documents using your iOS device
Go to Settings > iCloud > Storage & Backup > Manage Storage.
Under Documents & Data, tap the app that has a document you want to delete, then tap Edit.
Remove iCloud documents using your Mac
If you want to save iCloud documents on your Mac while removing them from iCloud, you can simply move them to your Mac, provided it has OS X v10.8 or later. For instructions, go to the Finder on your Mac, choose Help > Help Center, then search for “save documents.”
Open iCloud preferences, then click Manage.
Select an app on the left, then select one or more documents on the right.
Click Delete (below the list of apps).
Remove iCloud documents using your Windows computer
Open the iCloud Control Panel, then click Manage.
Select an app on the left, then select one or more documents on the right.
Click Delete (below the list of apps).