Resell orders in Oasis can be filtered to show only the products for a selected manufacturer.
Here's a picture of our resell order with two manufacturers on it.
By clicking the small button at the top, we get a pop up window asking us which vendor to show.
Selecting one of the manufacturers will filter the list to show only items from that manufacturer. If you have the list filtered, you can clickon the Show All button to list the order without filters.