IIRC, when I using bitpim, I just drag/drop files into the ringtone folder. I have just transferred wallpapers//pictures/ringtones from my LG VX8100 -> LG Dare, but haven't added any new ringtones to the phone fro awhile now (haven't used bitpim for almost 6 months, so a bit rusty)
They go in the My_Audio folder. Can not be used from MicroSD card but all u have to do is transfer from card to phone. U can either use the USB cable or flip flop the card back and forth from the computer to get them on the card.
Wirelessly posted (E2: LGE-AX830/1.0 UP.Browser/6.2.3.8 (GUI) MMP/2.0) U have to use bitpim . to long to type out on glimmer but google will help!
watch my video on how to make glimmer ringtones YouTube - make ringtones for the LG Glimmer(Part 1 of 2)