In a first aspect, the current invention provides a method for manipulating a computer aided design (CAD) model, comprising the following computer-implemented steps of: —obtaining a composite object comprising a 3D geometry; —defining a 2D cross section of the composite object; —selecting a pattern of an event; —displaying the pattern; —applying modifications to the pattern, whereby the modifications are saved as a 2D patch, directly linked to the 3D geometry. The method according to an embodiment of the invention is particularly suitable for linking the maps providing 2D details, used on a construction site, to 3D composite objects and is particularly useful to avoid incompatibilities between the 2D and 3D information. In a second aspect, the present invention provides a computer program product for manipulating a CAD model. In a third aspect, the present invention provides a server for manipulating a CAD model.