We can convert all negative values into zeros in Saved Search using the following :-
1. ) Navigation : Lists > Search > Saved Search > New > select the type of search
2. ) On the Results tab > Column subtab ;
Field = Formula (Numeric)
Formula = CASE WHEN {field for comparsion} < 0 THEN 0 ELSE {field for comparsion} END
3. ) Save and Run
For example,
CASE WHEN {Qty to Order} < 0 THEN 0 ELSE {Qty to Order} END