Consider two options:
1) Calling two strategies with IClient.startStrategy i.e.
IStrategy strategy1 = new StrategySimple();
IStrategy strategy2 = new StrategySimple();
((StrategySimple)strategy1).amount = 0.01;
((StrategySimple)strategy2).amount = 0.02;
client.startStrategy(strategy1);
client.startStrategy(strategy2);
2) Implementing a strategy which combines calls of other strategies, see:
https://www.dukascopy.com/wiki/index.php ... a_strategy