Praneeth
Forum Moderator

Hi Changming Song,

Here are the screenshots of the model. My apologies for getting back to you late, I had to recreate the model as we do not store the models.

 

I agree that "attach to original object" should be used for creating a parametric design. 

If it helps, I have created the rectangle1 array first, then created the polygon2 array and then subtracted the latter one.

Hope this helps.

Best regards,
Praneeth.