GPO 4 Harp glissando and harmonics

Hi, how can I use that in notion ?
I tried to put a ° for harmonics but it doesn't work, and reading the pdf for custom rules it seems that there is nothing related to harmonics ...
If I put glissando in the score, it tries to imitate it instead of loading the right sounds ... solutions ?
Since in aria it seems that chromatic harp, glissando harp and harmonics harp are 3 separate instrument at least I wish to load them on the stave with the shift+i trick but it seems that notion only knows "harp" from gpo that corresponds to the chromatic one ...
I don't really want to load 3 different staves for the harp, please ....
Thanks
I tried to put a ° for harmonics but it doesn't work, and reading the pdf for custom rules it seems that there is nothing related to harmonics ...
If I put glissando in the score, it tries to imitate it instead of loading the right sounds ... solutions ?
Since in aria it seems that chromatic harp, glissando harp and harmonics harp are 3 separate instrument at least I wish to load them on the stave with the shift+i trick but it seems that notion only knows "harp" from gpo that corresponds to the chromatic one ...
I don't really want to load 3 different staves for the harp, please ....
Thanks