How to Change Conditions while creating PO

Hi ALL

While creating the PO, i need to change the value of certain condition type.

I am able to do for PB00 condition, but i need to change it for other conditions.

For example, if there is any discount condition, i need to be able to change the value, when PO is getting created

Can you please help on this

Regards

Madhan Doraikannan