Unity Script Reference:
Legacy Documentation: Version 4.3.0
StaticBatchingUtility.Combine
static function Combine(staticBatchRoot: GameObject): void;
static void Combine(GameObject staticBatchRoot);
static def Combine(staticBatchRoot as GameObject) as void
Description

Combine will prepare all children of the staticBatchRoot for static batching.

Once combined children can NOT change their Transform properties, however staticBatchRoot can be moved.
static function Combine(gos: GameObject[], staticBatchRoot: GameObject): void;
static void Combine(GameObject[] gos, GameObject staticBatchRoot);
static def Combine(gos as GameObject[], staticBatchRoot as GameObject) as void
Description

Combine will prepare all gos for the static batching. staticBatchRoot will be treated as their parent.

Once combined gos can NOT change their Transform properties, however staticBatchRoot can be moved.