Let's say I bought 100 shares of company XYZ at 10$ a share. I think that the market price will rise to 12$, so I would like to sell ALL MY SHARES at 12$ (that's the limit sell order).
On the other hand, I'd like to protect myself in case things don't go as I expected (and let's also imagine that I am not able to constantly monitor the market). I would like to sell ALL MY SHARES at 8$, in case the price fell to that level (and that would be the stop sell, or stop loss order).
How can I do this? If I place a sell order at 12$, my shares end up reserved in the order book and I am not able to set the stop loss at 8$.
I used stocks as an example, but I am actually asking this for cryptocurrency trading (but I guess it is the same).
Are there trading platforms which supports what I would like to do, or is it impossible?