A method, system, and computer-readable medium are provided for creating, inserting, and reusing document parts in an electronic document. According to a system, a word processing application program receives a selection of a document part category. In response to the selection of the document part category, a gallery of document parts is displayed in a user interface. A selection of a document part from the gallery is received and inserted in the electronic document without the need for additional formatting. The gallery of document parts defines a page layout for the electronic document. Document parts may be created within the user interface by modifying pre-built document parts.