how to use all the pll's to create clock

Hi,

I want to use all the pll's to generate 42 output clocks.

when i try to compile my project i get the error message " Error: Design requires 42 clock signal(s) of type Global Clock but device can contain only 16 clock signals of type Global Clock"

how do i define the extra clocks so I will be able to use them as outputs?

BTW I use ARRIA II GX device.

thanks...