It sound like you want to enter a parameter in all 15 field displaying in your query, but when you use
=[Enter Supplier ID], etc
You don't get anything to show up. It is probably becuase some of you parameters are left blank (you want everything for that parameter, that is avialable). What you need to do it change you parameter to
like [Enter Supplier ID], etc
and the you want everything that is avaialable for a certain parameter enter a * (which is the wildcard character meaning anything)
To simplify this process for you users I would create a form where you hav ethe enter there criteria and base you query on the values stored on the form.