I don’t think any of it needs to be “separate”. The inner leaf folds just need to be small faces you can lower once you’ve extruded the overall shape. What you’re missing here is an inner set of quads that defines these inner parts. If you’ve look at JL modelling the CG cookie logo in Core he does something similar conceptually for the mouth. Not at my PC atm so can’t open .blend. Will post a demo screenshot later