It helps if everyone is using the same terminology. In phpbb, the whole thing is called the "board".
phpbb.com/community is the board.
within the board you have categories, phpBB 3.0.x is a category.
under categories you have forums,
under phpBB 3.0.x is this forum we are in. ( 3.0.x Support Forum )
under forums you have topics.
we are currently in the topic "Deleting Sub-Post"
which is in the forum "3.0.x Support Forum" which is under the category "phpBB 3.0.x" which is on the board "phpbb.com/community" .
my post that you are reading now is a reply to the topic which can be called a post or a reply either way.
actually, the topic is a post as well. that is how you create a new topic. you make a new post in a forum.
then, all replies to that topic/post are considered either replies or posts.
I'm baaaaaccckkkk. still doing work on donation basis. PM your needs.
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If a tree falls in the forest and nobody is there, does it make a sound?