Thanks Peter for your instructions above. Exactly what I needed.
To create new (NK-ROC) svg images starting from existing svg image... yes piggybacking on work done by other good people is so productive.
* open existing svg file in Inkscape
* apply ungroup function to disassemble the existing image in smaller drawing pieces (primitives)
Note: SVG primitives might be saved in an "NK-ROC parts svg library" for later reuse.
To create new (NK-ROC) svg images starting from existing svg image... yes piggybacking on work done by other good people is so productive.
* open existing svg file in Inkscape
* apply ungroup function to disassemble the existing image in smaller drawing pieces (primitives)
Note: SVG primitives might be saved in an "NK-ROC parts svg library" for later reuse.