In the search for more cash to pursue its switch to electric cars, the Volkswagen Group is apparently moving forward on plans to list its sports car subsidiary Porsche on the stock exchange. There has been speculation for some time about an initial public offering (IPO) of Porsche. The cash-cow has for years punched above its weight when it comes to contributing to the VW Group’s profits. VW announced on Tuesday that it was in “advanced talks” about the move with holding company Porsche Automobil Holding, which is also VW’s major shareholder. Volkswagen and Porsche Holding had negotiated a agr…