Hi Connie,
this application can be founded in the P4210, Order Review / Check Price History. It will show you the history to compose the sales price, if you have Base Price (price from a certain Item#) and all adjustments from Adv Price (discounts, increases, etc).
You can call this application by itself setting up a version from P4210 to be associated with. In this case you can simulate price with the same conditions (price + adv price).
Maybe You can explore the usage of P42101 to have more features from SO processing, when entering the items, you can have Item availability, pricing, etc, in the same screen.
However, if you intend to push prices or availability prior a Sales Order, then you can use reports based on Availability or Pricing
Good Luck!