1. Set grid to view 1000 per page


2. Select the Supplier from the 2nd filter on the page


3. Use Multi Item Actions --> Select All on Current Page


4. Use Multi Item Actions --> Force OOS


5. Then use Multi Item Actions --> Force Update Selected


6. If you have more than 1000 items from the Supplier, then move on to page 2 and repeat steps 3-5 and so on.