Assuming you have root....
1) copy the ringtones and notifications to /system/media/audio/...
2) change permission and ownership to match others in that directory
3) delete/rename the ones on your SD CARD so they won't be found
4) reboot so ones in system are found
5) select again
Phone: HTC EVO 3D, rooted from HBOOT1.30 with Revolutionary Method
Recovery: TWRP 1.1.1
ROM: ViperROM 2.5 RC2