Remove dangling beams option is to remove beams that are not attached to a solid or another beam on both ends in beam-based lattice.
Starting with Creo 8.0, you can control which surfaces should be used to remove the dangling beams. The old on/off approach is eliminated now, and this improvement provides a more flexible way to remove dangling beams and a better control over the lattice creation. Click here to learn more
User Interface: In part mode, click Lattice > Cell Fill > Dangling beams > Keep/Remove/Remove by surfaces.