im searching for any easier way to make core and cavity split.

Right now i'm using following tools:

-split line and parting line

-then ruled/planar/boundary surface and fill option to make a surface around part.

Some of you prefer using "Assembly method" , unfortunately i can't find any complex example made in this method. Can someone post solidworks files made using this method?

I've attached the part what i have to split.

I've already done it using surface modeling method. I would like to check your methods to see which workflow is most efficient in my company.