Because I only find programs that do the opposite thing, wrap an Ethereum based token in order to make it fit on the BSC, for example, the wrapper present on TomoChain.
The process that you have described is called bridge transfer. Bridges provide us with the opportunity to transfer tokens from one chain to another, but they don’t physically move, they are just locked on one network and certificates on a target chain appear. There are bridges between BSC-Ethereum as well, you can check binance’s official web-site for this purpose.