Resmed's Australian shares RMD.AX jumped about 3%, while CSL CSL.AX was up 1.1%. Jan 31 (Reuters) - Australian shares rose slightly on Tuesday, set for their best month in more than two years, as investors globally awaited a slew of central bank policy decisions, including from the U.S. Federal Reserve. Global stocks retreated overnight ahead of central bank policy announcements and data that may shed light on whether progress has been made in bringing down inflation.