Assign pin number to multiple parts of homogeneous package in OrCAD

Hi All, a newbie quetion here. I have got a package with 2 logic gates (6 pins) and I am working on the schematic symbol of it.

The pin 1, 2 and 5 make up one logic gate while 3, 4 and 6 make up the other.

I guess I shall create a homogeneous  package with 2 parts. The question is when I place the pins, I can only assign 3 pin numbers (1, 2 and 5) since there is only one part in the parts Editor of OrCAD. 

How can I assign the 3, 4 and 6 to the other 3 pins? is it only done when the 2 parts of the package are placed in the schematic?

Thanks in advance.