It's a feature of calibre. In the Library Management sub forum there is a sticky that gives a lot of information about it. Basically it allows you to change what metadata is put into certain fields when sending to a device. You can set it up in preferences.
A simple example is creating a plugboard that puts the tile - series series index in the title metadata of the file.
Sorry, I can't be be more help. I haven't used this feature myself.
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