I once create a big autotext list and now I don't need it anymore.

This is what I did and what happened. Delete the big autotext in BB using DM, then transfer the default autotext from the backup. All is well. However after half day, the big autotext is coming back. I think it is sync from the BES server.

Now my question is how do I get rid of the big autotext w/o delete the entries one by one?

Thanks.