iBooks 
Import an ePub file
You can import an ePub 2 or ePub 3 file as a new book project in iBooks Author.
Important: iBooks Author does not import ePub files that are DRM (digital rights management) protected.
Import an ePub file
Choose File > New from ePub File, choose the file to import, and click Open.
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Choose a template, and specify the following import options:
Import the paragraph styles in the file: Select the “Preserve paragraph styles” checkbox.
Import the media and graphics in the file: Select the “Include media and graphics” checkbox.
Note: You can also create your own template, and import an ePub file into it.
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Click Choose.
In iBooks Author, the first two levels of the imported ePub file’s table of contents are preserved, and subsequent content levels are flattened.
Tip: To replace a font after you import an ePub file, choose Format > Font > Replace a Font.