Customer Order - Special Price define matter

[tay@xxxxxxxxxxxxx]

Dear Sir,
We are using BPCS CD Ver.4. We would like to define the special price(ESP
file) method into 1.Customer +Item number and 2.Item number only. When we
key in customer order, normaly we need to use method 1(Cust + Item) to get
the sales price, and sometime(promotion period for particular item number),
we need to use method 2(Item number only) to get the sales price.
Anybody can tell me how to solve my requirements(method 1 and 2 must
existing at the same time)  ?
Your help are appreciate.
Thanks

>From :Tay