RpReports is designed to let you create attributes - such as cost per sq foot, etc. for components - place the components into SketchUp and create reports.
It is designed for applications where you create a library of components and distribute it to your dealers, or clients, who place the components and create a parts list with prices.
Because of its price, and the up-front work required to create a component library, define attributes, define formulas for calculations and design reports - it is designed for large projects, and not for individual users who want an occasional report.
See: RpReports