Here is how to do it, filtering with the field keywords={nocite}:
\documentclass{book}
\usepackage[utf8]{inputenc}
\usepackage[backend=bibtex, sorting=none, style=numeric-comp, defernumbers]{biblatex}
\addbibresource{myownlittlebiblio.bib}
\begin{document}
\nocite{*}
\printbibheading
\printbibliography[keyword=cite,heading=subbibliography,title={Cited papers}]%
\printbibliography[keyword=nocite,heading=subbibliography,title={Supplementary papers}]
\end{document}
The .bib file:
@book{B1,
author = {Name1, Surname1},
title = {Title of the first book in the \emph{Cited} category},
publisher = {Name of the Publisher},
year = {2017},
keywords = {cite}
}
@book{B2,
author = {Name2, Surname2},
title = {Title of the book in the \emph{Not cited} category},
publisher = {Name of the Publisher},
year = {2016},
keywords = {nocite}
}
@article{A1,
author = {Name3, Surname3},
title = {This is the title of first article in the \emph{Cited} category},
journal = {Name of the Journal},
year = {2017},
volume = {01},
number = {12},
pages = {1-20},
keywords = {cite}
}

If you want independent numbering of the subbibliographies, add the option [resetnumbers] to the \printbibliography commands:

biblatex? – Bernard Jun 21 '17 at 12:47\usepackage[backend=bibtex,natbib=false,sorting=none,style=numeric-comp]{biblatex} \addbibresource{references.bib} % The filename of the bibliography \nocite{*}
– OOzy Pal Jun 21 '17 at 12:54