You can currently do this in the New Supply & Demand Screen. In the upper right corner select the gear icon, in the settings section/general tab, change the Lookup Mode to Inventory Cross Reference. Exit out then when you start typing in the Part Number (or click the magnifier icon) this will open a much bigger screen where It will search for Customer and Vendor Part Numbers also. You might need to click on the Green Refresh button when the Search opens so it generates the tables for the cross reference.