My question is how to manage the swatches palette to show ONLY the reduced amount of colors used in a certain sketch. The manual starts by saying how to apply a color from the palette, but the instructions on loading colors to it never come.
Supposedly, you start a new document with an (almost) empty swatches palette (that doesn't happen at Inkscape, it's full of tints). Then you set a color in the color palette (being CMYK, RGB, etc) to be applied to an object. Ok, your little pink pig

I find this a very natural way to work, which you can practice at i.e. FreeHand by dragging the color from wherever you find it, the sketch or the color palette, and dropping it to the swatches palette. But how can I do such a simple thing at Inkscape? How can I get the swatches palette empty for MY swatches? Or it's not the way I should work with it?
(Please don't tell me to create a customized swatches palette at GIMP in this or that folder. That's the closer I got to the solution, but I can't believe it. Besides, my OS tells me I don't have permission -in my own comp!!!- to make changes in that root folder, and that's another search to me)
Thanks so much.