I tried finding tutorials but nothing super similar to my project was found.
Someone has asked me to create straw toppers; so I need a 5/16" cylinder indentation made into the bottom of the topper object. I've got the topper sized and the cylinder is created and positioned. I just don't know how to use the cylinder to create an indentation into the topper.
The mesh file your starting with has a hole(s) in it so it's a surface body instead of a solid. I would do this entire project in mesh mixer or some other mesh editing software. fusion is not a good program for editing this type of model. Mesh models and nurb/brep models (like what fusion makes) are completely different animals.
The SURFACE body that exists doesn't seem to have any holes in it. It just needs to be stitched together so it turns into a SOLID body. Then you can make the recessed hole in the bottom.
This video I've made for you is longer than it needs to be, because I wasted the second half of it just moving the helmet closer to the origin so I could create a section view.
But honestly working with triangulated mesh files in Fusion, while possible, is not recommended if you have Meshmixer or other software that is designed for the task.
