I have products in CRM and Items in Inventory integrated we need a fuction to calculate Market Price and selling price based on the price of the ITEM GROUP!!!

I hve created 3 fields namely base price, factor 1 and factor 2 in CRM and inventory and its integrated 2 ways!!! i have a 4th field named Market Price which is sum of three fields- which i have achieved in CRM but cant pull to inventory