How to place Stop-Limit order below current price, and multiple Limit orders above?

I purchased 500 shares of an ETF at $64. I want to set up a stop-limit to sell all 500 shares if the price hits my stop of $63.80. But if the price goes up, I want to sell 200 shares at $64.50 and 300 shares at $65.

I know how to do an OCO with just two orders (for instance if I wanted a stop-limit at $63.80 and to sell everything above $65). But I can’t figure out how to create something with three orders like this (with two or more limit orders above the current price, each selling a portion of my holdings as the price moves up).

I am using the ThinkOrSwim trading platform from Ameritrade. Whenever I try to create the first two orders (the stop-limit at $63.80 and the limit at $64.50), if I then try to create another limit order to sell the remaining 300 shares at $65, then thinkorswim cancels the first order (because it treats it as conflicting with the stop-limit, I think).

What is the correct way to create an order like this in thinkorswim?