I have an EA which is have specified 2 time frames to run on (1 hour and 15 minutes)
When I run the EA, do I need to open 2 charts with different time frames and run the ea on the 2 charts?
What would be the best solution if I would only like to run the EA on 1 chart but the EA will take trades from the 2 time frames which I have coded in
No only if you want to use visuals in/on it.
Otherwise you can run all frames in one.