How to enter Manufacturer and Manufacturer number in the item card?

In Dynamics NAV, Where should I to enter manufacturer and Manufacturer number in the item card. This information is different that vendor and vendor item number as we may purchase same item from different vendo

Have you tried to use item cross references?

I don’t think this is a cross reference issue, basic manufacturer name and manufacturer actual item number that I want on the item master record.

From the item card, click the Purchases button on the bottom, then select Manufacturer. This brings up a table where you can enter multiple manufacturers and manufacturers item #s. Note that only the line you select as Default will show on the item card on the Replenishment tab.