In the performance report you can search for the "Wgt%" field, that's the profit contribution of every asset to the whole portfolio.

http://www.zorro-trader.com/manual/en/performance.htm

If you want to plot individual equity curves, apply to every asset the code showed here in "Plot equity curves of single assets in a multi-asset strategy".

http://www.zorro-trader.com/manual/en/tips.htm