Assuming (Under That Premise)
2 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
Members
としたら / ものとして
Setting up a working assumption in a written argument or a plan.
～ものとして vs ～としたら: Use ものとして. It fixes a premise that the rest of the reasoning proceeds on, which is why it appears in contracts and planning documents. としたら floats a hypothetical for consideration, so it does not commit the argument to anything.