how to provide draft for a part without affecting the neutral plane(parting surfaces)?
There will be a option of draft in ug nx go click that object which u want to draft and mention the draft angle if u don't see a draft icon just search in command finder
There are various ways to switch to drafting once you are done with the part itself. The simple one being, click new and select drafting with appropriate units. The modeled part should load in reference and drafting should be straight forward from there.