When you do the purchase order entry in M3, you may face the difficulties to know what is the supplier code you should input for the item addition.

In the Supplier column, right click the input box and select Browse OR you can click on shortcut key "F4" to open the M3 Browse pop out panel.

In the M3 Browse if the Search Key is not what you want for filtering, you may click on the Options button, and select the filtering field they provided.

In Supplier browsing, you may filter by Search Key, Name on Address, Forwarding Agent Number or Forwarding Agent Name.

In the filtering field Key in the Supplier Name for Search Key and click "Enter". Find on the related supplier and click "Select". Then the Supplier number would be input automatically in the input box.