1. Open Inventory Management, Main, Item Maintenance
2. Select the Item Code
3. Click More (or the drop-down chevron button at the top right)
4. Select Vendors to open the Item Vendors Maintenance window
   1. Select Vendor No
   2. Enter Vendor Item Code
   3. Enter Lead Time, if applicable
   4. Select Vendor Warranty, if applicable
   5. Click Accept
5. Click Accept

Note: The steps above will populate both the IM_ItemVendor.m4t and IM_AliasItem.m4t files. If you delete a Vendor Item Number from Item Vendors Maintenance the Alias Item Number will be deleted from Alias Item Maintenance, and vice versa.