Money management in portfolio

 

Hello
For example
There are 4 different mql strategies 4 currency pairs
One account metatrader 4
How to calculate proper optimal money management %?
For each individual strategy
Different timeframes
And initial account size?

there are 4 different strategies sitting on one Metatrader 4 account
and they are all can trade at the same time
do I then split overall 2% into 4? so each strategy in portfolio of 4 gets 0.5% of an account?