[r-a-y]

Well if I use the bbopress in buddypress for new installation, HOW do I add forum sections?

You can’t add forum sections.

BuddyPress forums are tied to groups. So you’ll have to create new groups with forums in order to emulate forum sections.

If you’re trying to setup BuddyPress forums to be like this:

http://testbp.org/forums

Remove bbPress and reinstall BuddyPress. This time, follow these instructions:

https://codex.buddypress.org/getting-started/setting-up-a-new-installation/

Specifically the “Setting Up Forums” section.

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If you plan on using a separate install of bbPress, you’ll need to theme it.

No way around this I’m afraid.

You could use Manoj Kumar’s BuddyPress theme for bbPress to get a similar looking BP feel:

http://manojkumar.org/buddypress-theme-for-bbpress/

Hope that helps!