Subtract Structure in HFSS Help!

Hi guys!

I want to create a cylindrical ring in HFSS.

I do it in this way:

First, I create an outer cylinder
After I create an inner cylinder
So I subtract the second from the first cylinder. (No clone)

I wonder if there is an option after the subtractrion to make these to cylinders to act line a uniform cylinder. My purpose is to build a cylindrical disk with many holes on it. I will do it with the method explained above. But I want this cylindrical disk to act like a unique cylinder.

You can try to combine the objects.