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Good to see you working. Only those face problems who do some work.
It seems you are facing problem with Surfacing. Also, if you have not worked on Top down approach for design, please follow Skeleton modelling to learn the approach. Let me know if I may be of any help.
Copy (publish geometry) Surface of parent / top model, propagate to model and Cut un-needed surface should solve your problem. But needs thorough insights of requirement.