Nov 3 (Reuters) - Canada’s main stock index was subdued at open on Wednesday ahead of an expected move by the U.S. Federal Reserve to trim pandemic-era stimulus, with weakness in energy stocks also dampening sentiment. At 9:30 a.m. ET (1330 GMT), the Toronto Stock Exchange’s S&P/TSX composite index was up 9.39 points, or 0.04%, at 21,179.4. Reporting by Amal S in Bengaluru; Editing by Maju Samuel