You can transfer custody, but the procedure is very troublesome, and it is generally not easy to transfer from the original place of purchase.

I think there are the following methods: first, directly sell the previous ones and buy them again in the securities company; Second, if you lose money and don't want to sell it, you don't have to worry about the original one, just leave it there and buy it at the securities company. Unlike stocks, stock accounts can only be opened in brokers, and funds can be purchased at the same time through multiple channels.