WebCopy executes rules in order until either a matching rule that halts processing is found, or all rules have been processed.
When creating new rules, they are appended to the end of the existing list and so you may wish to order them.
Rule lists support drag and drag re-ordering. Hold down the left mouse button over a rule and while keeping the button pressed, move the mouse. A insertion line will be displayed showing where the rule will be moved to, release the mouse button to complete the move.