You can do it in the DB, or you can read Figback65's post which explains the #grid add command and do it in-game with that.
Keep in mind that as he mentioned, his notes are for P99, which is not EQEmu. Our commands may be slightly different, but you can use the #help command to search for the grid related commands as I posted earlier in this thread. Also, I don't believe P99 has the #wpadd command as that was added after they forked from EQEmu, so that may be why it wasn't mentioned in his notes (even though it is a very useful command to quickly path a zone using a few hotkeys).
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