How can I change the chapter or section TOC’s indentation without changing the main TOC indentation

I was using TOC filed code with /b to create a TOC under Section 1 that only shows heading3 title and page numbers. But it always has 0.4″ left indentation, how can I set zero indentation just for Section1 TOC, but still keep 0.4″ left indentation in the main TOC. Also I want the Section1 TOC should still keep zero indentation after update TOC itself. Please click the picture link for details below.

Thanks.

TOC Image