Sharing some knowledge
all sub-heads that i was able to find
0 - P2P_SUB_HEAD_USER
1 - P2P_SUB_HEAD_GRENADE
2 - P2P_SUB_HEAD_DROPEDWEAPON
3-6, 9-13 - P2P_SUB_HEAD_OBJECT
7 - P2P_SUB_HEAD_NPC
8 - P2P_SUB_HEAD_STAGEINFO_CHARA
14 - P2P_SUB_HEAD_STAGEINFO_MISSION
15 - P2P_SUB_HEAD_AI
16 - P2P_SUB_HEAD_DOMISKILLOBJECT
17 - P2P_SUB_HEAD_DOMIEVENT
18 - P2P_SUB_HEAD_SENTRYGUN