Can you sub half and half for whipping cream?

It depends on the food being prepared. If the whipping cream needs to be whipped, half-and-half will not do, because it does not whip up in the same way as whipping cream. It may be substituted when cream is called for in cake batter, scones or in a sauce, for example. But the resulting product will not be as rich with half-and-half as a substitute.