If you have a PDF document that was created in Adobe Acrobat or some other application, which you would like to use as the basis for creating a new PDF form in LiveCycle Designer ES, you can use the Create an Interactive Form with Fixed Pages option in the New Form Assistant to import the content of a PDF document like this as the background artwork for a new form.
If the PDF document was created in Acrobat and contains form fields, LiveCycle Designer ES converts those fields to the corresponding library objects. After you import a PDF as artwork, you can place additional library objects on top of the artwork to augment the new form design.
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You can only import PDF documents as artwork if the document was created in Acrobat or some other other application capable of generating PDF documents. If the PDF document was created using LiveCycle Designer ES, you cannot import the contents as artwork; you can only import the contents as editable form objects.
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After you import a PDF document as artwork, you must save the resulting form as an Adobe Static PDF Form. You cannot save the form as an Adobe Dynamic XML Form or Adobe XML Form. The default file type for new forms that contain PDF artwork is Adobe Static PDF Form (*.pdf).
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The following library objects are unavailable in the Standard and Custom groups when importing a PDF document as artwork: circle, content area, image, line, rectangle, subform, table, text, masked field, masked field – partial, page n of m, sheet n of m, signature – print and sign, and survey question.
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If you open a PDF document that contains background art in an earlier version of LiveCycle Designer ES than the version used to create the document, the image data in the document may not be displayed correctly.
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Document, page, and field-level JavaScript script (in the PDF document imported as artwork) is converted into event scripts that are commented out. You must verify and update the scripts to match the LiveCycle Designer ES model. You can no longer edit this script in Acrobat.
See also 

About importing PDF documents as artwork