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All Slivers have banding. (Any creatures with banding, and up to one without, can attack in a band. Bands are blocked as a group. If any creatures with banding you control are blocking or being blocked by a creature, you divide that creature's combat damage, not its controller, among any of the creatures it's being blocked by or is blocking.)
A player who controls a creature blocked by or blocking multiple creatures must choose a combat damage assignment order for those creatures. If each creature in that order loses banding, the order will be enforced. Otherwise, the player who controls the creature with banding can assign the other creature’s damage ignoring the damage assignment order and without assigning lethal damage to a creature before assigning damage to another creature.
Creatures don’t “share” abilities in a band. For example, if Banding Sliver bands with a creature with flying, Banding Sliver can be blocked by a creature without flying, and this causes the blocking creature to also block the creature with flying.
While blocking, a creature with banding can block along with any number of creatures. This isn’t a “band,” but it’s similar for how damage assignment is modified.
