Grains in multigrain bread - to soak or not to soak?

[dwdanby]

I've been using Steve's Kitchen on YouTube to make no-knead dinner rolls with half wheat flour, half bread. Very successful. Now I want to add "X" amount of Bob's Red Mill 5-grain cereal; I need help with the amount, and also, do I then decrease the amount of flour? and last but not least, do I soak the grains beforehand or just put them in with the flour? I've seen recipes both ways. Thanks all!