Code Civ. Proc., § 872.720

(a) If the court finds that the plaintiff is entitled to partition, it shall make an interlocutory judgment that determines the interests of the parties in the property and orders the partition of the property and, unless it is to be later determined, the manner of partition.

(b) If the court determines that it is impracticable or highly inconvenient to make a single interlocutory judgment that determines, in the first instance, the interests of all the parties in the property, the court may first ascertain the interests of the original concurrent or successive owners and thereupon make an interlocutory judgment as if such persons were the sole parties in interest and the only parties to the action. Thereafter, the court may proceed in like manner as between the original concurrent or successive owners and the parties claiming under them or may allow the interests to remain without further partition if the parties so desire.