sketching inside thee cooling passages of gas turbine blade

i'm working currently on my bachelor thesis on cooling gas turbine blades and as a beginner on solid work software i face a problem in how can i sketch inside the cooling passage is there a way to cut the blade from the middle with a spline so i can draw pins and rips inside the cooling passage
drawing the blade is not that easy since there is no any geometries available on internet so its just a simplified blade