as to

1. Regarding or referring to; with respect to; apropos of. As to the matter at hand, we must act firmly and without delay. Now, as to your question, Ted, I'll answer it during today's lecture. As to that proposal, I think we should postpone it for now.

2. By means of or according to. Please catalogue the entries as to their size in millimeters. Is this list organized as to employee seniority or what? Have you organized the applications as to each applicant's years of experience in the field? Great, thank you.

as to something

used when you are referring to something: As to tax, that will be deducted from your salary.