A computer-implemented method for manipulating three-dimensional modeled objects of an assembly in a three-dimensional scene, comprising the steps of: determining at least a first set of at least one object and a second set of at least one object among said three-dimensional modeled objects of the assembly; grouping the at least one object of the first set in a first three-dimensional bounding box (BB) and the at least one object of the second set in a second three-dimensional bounding box (BB); and relatively reorganizing the bounding boxes (BB).