I am attempting to cut through the four spots as indicated in the pictures, but the cut is not going through the blue selected part shown in the attached picture. I'm totally lost. Any help would be greatly appreciated.
" bigger undercut " is a surface body.
As Shaodun Lin has pointed out, your model has both solid and surface bodies. To cut thru. surface, you can use trim feature as shown in the image and attached SW file. Cut feature can only be used for solid body
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