Waive bid preferences are not available in all configurations. If you don't see Waive bid preferences they are not available.

Waive bid preferences tell the N-PBS Scheduler that you want  certain rules adjusted or disregarded while your block is built. Some rules can be completely disregarded, while other rules can only be adjusted. The rules that you can waive are all visible in the interface. If a rule isn’t visible, you can’t waive it.