After reading in the forum about the format for color palette I tried and created which are now added in the my Inkscape. I can use colors there isn't any problem except one thing I would like to clear.
First of all when I tried to follow the format and used "Wordpad" txt, file extension gpl, and saved (below is a few RGB values for example purpose only)

GIMP Palette
Name: Ari
#
177 196 187
186 179 47
168 159 77

the color palette did not appear in the Inkscape, then I kept trying by looking at the Inkscape original gpl files but only this format worked so far:
GIMP Palette
Name: Ari
Columns: 3
#
177 196 187
186 179 47
168 159 77

It is good I can use colors I created but when I open Inkscape and choose my color palette it work fine except when I put cursor on the desired color the entire palette shiver(up and down) a little which is strange. However, when I use the original Inkscape color palette I do not face such thing.
Therefore, the question is am I doing some thing wrong? Or is it the tabulation gap between RGB numerical?
And if the problem solved want to share that colors with others too

Please share your thoughts and oblige.

Thank you

I'm sorry no one has answered your questions yet. I'm afraid that I don't know much about custom palettes, so I haven't commented or offered suggestions. But my reply here will bring this topic back up to the top. Maybe someone who knows about custom palettes will see it this time

PS - I do know a little about using the auto palette. Maybe that would work better than a custom palette? See http://tavmjong.free.fr/INKSCAPE/MANUAL ... r-Swatches and http://tavmjong.free.fr/INKSCAPE/MANUAL ... omSwatches. If not, then someone surely will answer about custom palettes soon