Welcome to the Q&A Forum

Hey Shalin, Assuming you have a large number of comments to deal with on those pages, the best option would probably be to delete those manual posts, then import the full 2000 posts using Wordpress's native import/export funtions, and then delete the posts you don't want. This process should only take 1-3 hours and is easier than your other options below. It's possible to get into SQL and export just the comments table, but because you've manually created those new posts, you would have to manually rewrite all of the post ids that the comments are tied to, and delete all of the irrelevant comments after that.. Plus, the possibility of a small typo messing up the import is high.

I literally did this, we had 1500 domains and I had to condense them all down into one two things to note: If you are moving Wordpress content into a clean Wordpress install make sure you copy the MySQL database to the new site and change the wp-config file so that it reflects the database that you want to use. If you are moving Wordpress content into an existing Wordpress install it might be easier to just manually edit them. I found that pulling text and importing them into something like TextWrangler allowed me to make sure all the formatting was correct, although the WYSIWYG is good, its not perfect. From there I just uploaded all of my pictures, pasted the new formatted text into the Wordpress text editor and added the photo! Let me know if you have any questions!