To 在这里不能省.
except as to 为一种固定用法,一般用于法律条文或其正式场合.它的意思是“xxx不在上述内容或范围包含之列”.
再给你几个例子：
【1】except as to title and liability for negligence resulting in death or personal injury,are hereby excluded.
【2】And that all objections except as to the form of the question are reserved to the time of the trial.
希望对你有一点帮助.