On the Job Preferences dialog, you can specify the method used to cut elements of a structure model.
On the Cutting of elements tab, specify how to cut:
Cut elements adjoining the slab while defining and modifying a building model
Elements adjoining the slab will be cut on an ongoing basis in the structure model as you define or modify a model.
Cut elements adjoining the slab while creating a drawing
Elements adjoining the slab will not be cut in the structure model as you define or modify a model (elements may interpenetrate with the defined slab). Elements will be cut as you create drawings (such as foundation plans or vertical sections through a building) of the structure model.
Cut elements while defining and modifying a building model
Steel elements will be cut on an ongoing basis in the structure model as you define or modify a model.
No cutting
Steel elements will not be cut in the structure model (they will keep their initial length) or in drawings.