as to

Preposition

With reference or regard to. / According to; in a manner conforming or corresponding to; in proportion.

Japanese Meaning

～に関して / ～について / ～に従って / ～に基づいて / ～に照らして

The committee had several questions as to the project's feasibility.

委員会はそのプロジェクトの実現可能性に関していくつかの質問があった。

Sense（1）

With reference or regard to.

As to your earlier question, I don't think I know the answer.

Sense（2）

According to; in a manner conforming or corresponding to; in proportion.

Grading as to size and color.