You know the layout of the data files right? Under Game Server are folders for NPCs, Monsters and Fields.
In PT, we usually refer to Fields, not maps.
There are a number of different types of file for each field. One contains NPC spawns, one just holds the spawn flags, and one is plain text and contains a list of the monsters which will potentially spawn.
The same monster can spawn in several fields, or no fields, or any field you like. It's monster file simply has to be listed in the Field file.
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asked at about the same time, regarding the same information ... but made more correctly, and politely. ^_^ (thus garnering more helpful responses)