You can use this function to copy the contents of one map into another one that you have previously created using ds_map_create(). If the ds_map that is being copied to is not empty, then this function will clear it first before copying. The original ds_map remains un-changed by this process.
|id||The id of the map you are copying to</>|
|source||The id of the map you are copying from|
inventory_2 = ds_map_create();
The above code will create a new map and assign it to the variable "inventory_2". It will then copy the contents of the ds_map indexed in the variable "inventory_1" to this new map.