Let's say you just created a paragraph in Heading 1 style. Now, you press Enter to go on to create the next paragraph. What style will that paragraph be in? You can modify a style to stipulate the style Word uses for the following paragraph. So you could set it up so that, when you're entering text, a Heading 1 will be followed by a Heading 2. And, you could set it up so that a paragraph in Heading 2 will be followed by a paragraph in style Body Text.

@MohanRajuM Repeating the same thing again isn't going to help. “Set page number for my catalogue” does not make sense in English; I don't understand what it's supposed to mean exactly. We don't normally talk about ‘setting’ a page number. Please explain in detail what it is you want to do. Are you talking about adding page numbers to every page in the document? Or are you talking about defining how the page number should be presented? Or something else entirely? – Janus Bahs Jacquet Aug 8 '17 at 21:33
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To modify the options, click the Multilevel List option (in the Paragraph Group). Word selects all lists currently in use in the List Library. You'll see two options below the gallery: Define New Multilevel List and Define New List Style. Use the first to create and save a stable custom list style. You'll use the second to change list styles. You can also use the latter to create a new style. So, what's the difference? The Define New List Style option lets you name a style, so you can share, modify, and delete it later. Most users will never need this option. Now, let's move on: choose Define New Multilevel List. Figure D shows the resulting dialog. document numbering in coreldraw