IMPORTED GRADING

I have many drill holes in a model and the grading will not import with them from PAD.  When I connect the drills with a line or lines before exporting, the grading shows up.  I thought, no problem, just delete the lines after import.
Well, the grading disappears for the drills  when I delete the lines connecting them, not the drills themselves though.
Why would this happen?
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