Hello!
I believe to have a solid idea on what you need, and, having a great deal of experience creating Telegram bots, I believe to be fitting for the task.
You want a telegram bot to read messages from one chat and, according to the message, forward it to a specific channel. If I'm correct, you wouldn't even need two Telegram accounts. One would suffice.
I still have a few questions to ask before starting the project (such as how would you like to setup the bot, how would you like to specify the chat the bot should forward to, etc...), but I'm sure a few minutes of your time would be enough to get me starting.
Sincerely,
Jean sidharta