As explained in this software, you can set the values of opening and closing positions, and you can also set the order of opening and closing positions, such as opening positions first and then closing positions at the same price, or closing positions first and then opening positions. These can be set.

Just open two condition sheets at the same time. It seems impossible to buy directly at the opening. Terms sheets are usually based on price, and some seem to be based on time, but I have never used them. You can open two trading windows at the same time, and then hurry.