Hi Nicholas,
1. Before you download the prop firm robots you first need to select the account size, Max loss, Max daily loss, Profit target, Risk, and News filter option. Then when you download the robots they will already include all these settings. When scaling all you will need to do is to adjust the lot size.
2. All the robots are separate from each other and do not interact. So if you selected the risk Medium (1% per trade) and you decide to trade all 10 robots your overall account risk will be 10%. Professional traders do not risk more than 2% on any one trade nor do they accept more than 6% per day. This will give you some guidelines as to how many robots to trade at one time.
3. For a 400K challenge the Max loss, Max daily loss, and Profit target will need to be adjusted. If the percentages for the 400K challenge are the same as the 200K challenge then all you should need to do is to double these amounts.
Alan,