level 2 headings with different styles

I have a contract, and the first part of it are the "Main terms & conditions". Then, the next part are the "Schedule". Headings as below:

Main Terms & Conditions
    1.0 Definitions
    2.0 Schedules/Ordering Procedure
    3.0 ...
Schedule A
    Project Development Services
    ...

I would like the 1.0 Definitions, etc. to appear as level 2 headers in the table of contents. However, their styling is different to the Project Development Services heading. Is it possible to have headings with different styles? I tried to create a new style, but couldn't find any way to assign a level to a style, if that is even possible.

I am using Microsoft Word 2013.

Word's TOC field can gather content for the ToC from multiple sources.

One source is "paragraphs whose styles have the Outline Levels specified by the \o parameter, so e.g.

{ TOC \o "1-2" }

Would give you a ToC with Heading 1, heading 2, and any other paragraphs whose styles have Outline Levels 1 or 2. (In other words, the current Outline Level of the paragraph is not relevant, AFAIK). In this case, a paragraph whose style has Outline Level n will appear at level n in the ToC.

You can set the Outline Level of the style by finding the style name in the style gallery in the Home tab, right-clicking, then selecting Modify... Then click the Format... dropdown at the bottom left and click Paragraph. The item you need is the "Outline Level" (which you cannot change for the built-in Heading n styles). You may not be able to modify the Outline Level if there are no paragraphs with that style in the document.

Another source is a list of specified style names using the \t parameter. This allows you to use styles that have no Outline Level. So if you want Heading 1, Heading 2, Heading 3 at ToC levels 1, 2 and 3, and "mystyle1" to be shown at ToC level 2 and "mystyle2" to be at ToC level 3, you can use

{ TOC \o "1-3" \t "mystyle1,2,mystyle2,3" }

If your Regional Settings specify ";" as the list separator character, you need to use ";" instead of "," in there.

You can also use the \t parameter to modify the ToC level where you want paragraphs with style Heading 1 etc.

These features are available from the standard ToC insertion dialog box (References->Table of Contents->Custom table of contents...->Options)