MultiCharts: Trading Software for Automated Trading and Backtesting

Hi

How do I incorporate broker charges for holding positions overnight? I know the interest cost I am charged but how do I reflect this is my strategy positions?

I'm actually trying to combine both a fixed commission per trade of $10 (regardless of size) plus a swap cost of 5% per annum based on value of trade and days position is held.

Can you tell me how to combine both into one strategy?

Are you talking about backtest?

Yes.