  We describe different types of self-trapped optical beams carrying phase
dislocations, including vortex solitons and ring-like soliton clusters. We
demonstrate numerically how to create such nonlinear singular beams by the
interaction of several fundamental optical solitons. Mutual trapping of several
solitons can be regarded as a synthesis of `soliton molecules', and it
corresponds to a transfer of an initial orbital angular momentum of a system of
solitons to a spin momentum of an optical vortex.
