pricing procedure in configuring condition type v/06

Hi,

In the master data area of v/06,field pricing procedure...when i do a F1 - the explanation is as follows

+"The system uses the pricing procedure that you enter here to control the use of condition supplements in records of this condition type. You can apply the discounts that are defined in the pricing procedure as condition supplements during pricing."+

Can some please explain me what that means and also please explain what

" Procedure

Enter one of the predefined pricing procedures that control condition supplements. If you leave the field blank, the condition supplement function in the screens where you maintain the corresponding condition records is inactive." means?

Thank You