  In this paper, we investigate the generalised monogamy inequalities of
convex-roof extended negativity (CREN) in multi-level systems. The generalised
monogamy inequalities provide the upper and lower bounds of bipartite
entanglement, which are obtained by using CREN and the CREN of assistance
(CRENOA). Furthermore, we show that the CREN of multi-qubit pure states
satisfies some monogamy relations. Additionally, we test the generalised
monogamy inequalities for qudits by considering the partially coherent
superposition of a generalised W-class state in a vacuum and show that the
generalised monogamy inequalities are satisfied in this case as well.
