how to output a gerber file of drill?

Hi All,

I am looking for a single drill file. I can find it in AD, but I can't find it in allegro.

We can get a NC drill file (I call it file1) by "Manufacture"->"NC"->"NC Drill".

Select as the following figure，and create artwork.We can also get a via file(I call it file2).

but geometrical figure in file1 and file2 are not the same - only smaller circle in NC drill(this is what I want)

when I open file1 and file2 together, I see following fig. Yellow circles are in file2(we can see more then 1 circle in each yellow figure). Blue circles are in file1.

I want to know if I can find this single drill file. If so, what should I do?

Thanks in advance.