Yes. Cultured buttermilk is not the same as 'old-fashioned' buttermilk, but it is the kind one often sees retail. (I buy old-fashioned and make cultured from time to time.)
Use about 6oz fresh, cultured buttermilk to 3 c milk. Put both in a clean jar, screw on the lid, then shake well. Leave in a warm area. It takes about 1 day but can go to 1.5. If it still isn't ready after that then the cultured buttermilk was not as fresh as it needed to be.