How to get around space limitations in iOS?
If you're asking if this can easily be done for different kinds of space hogs, the answer is yes.

For example you could be using iCloud to push photos, videos, etc. out in the cloud to limit the amount of space used on the device itself.

You can also purchase wireless disks, tethered disks, etc. to store files on there. They usually come with third party apps to manage the space and move files around.

Note however that you cannot keep apps anywhere but the local device if you want to be able to run them.