Multivendor is a core modification which allows the player to access multiple vendor views from a single NPC.
Using this method you can create unlimited amount of vendor views.
The coremodification allows the creation of multiple vendors through the default database gossip tables as well as through C++.
You can also mix any other gossip options with the multivendor gossip options.
The item lists for the vendors are stored in
npc_vendor as usual.