Creating Pages with the Page Builder 
The runtime authoring environment of the Page Builder enables you to create a container-based layout, assign CHIPs to this layout, and define wiring connections between CHIP components. It is based on, but considerably enhances, the generic configuration already available in Web Dynpro ABAP.
The Page Builder has been implemented as application WDR_CHIP_PAGE of Web Dynpro component WDR_CHIP_PAGE. The pages that you create with the Page Builder are configurations of this Web Dynpro application.

Runtime Authoring Environment of the Page Builder
To create pages in the Page Builder, you need authorization S_PB_PAGE.
For more information, see Authorization Checks for Page Buillder