# Merging two Discourse forums **URL:** \ **Category:** Migration\ **Created:** [October 23, 2017, 12:23am UTC](https://meta.discourse.org/t/merging-two-discourse-forums/72578 "2017-10-23T00:23:27Z")\ **Posts on this page:** 1\ **Showing post:** 1
**Author:** ![omarfilip](https://sea3.discourse-cdn.com/meta/user_avatar/meta.discourse.org/omarfilip/32/208019_2.png) [@omarfilip](https://meta.discourse.org/u/omarfilip)\ **Post date:** [October 23, 2017, 12:23am UTC](https://meta.discourse.org/t/merging-two-discourse-forums/72578/1 "2017-10-23T00:23:27Z")
> [@sam](#): > > These days we have a category importer and exporter that @neil built, you would use that to merge instances I’m trying to use this and I am not having much success. > [@Move topics from one Discourse instance to another](https://meta.discourse.org/t/topic-and-category-export-import/38930): > > Need to move some stuff from one instance of Discourse to another? There is a command line tool to export a topic, a set of topics, or an entire category, and another to import them in at the other end. Topic Export/Import one or more topics and their replies the users who posted in the topic Category Export/Import the category and all its subcategories its security settings custom groups mentioned in the security settingswarning if any of the groups have ‘membership requests’ enable… Discourse A has ~100k posts and Discourse B ~30k posts. I’ve moved all categories under one main category and then exported it from Discourse B. When I import into Discourse A only 5 posts are added and two are attributed to an incorrect user. For the incorrectly attributed example post I’ve noticed that in Discourse B it was made by a user with a user id 176, and in Discourse A it is attributed to a user with the same user id. But those are two distinct users. No users in A and B have the same email address, but ~100 have the same user name. Oddly, when I first tried a test to see if this could work, I ran the export-import and it seemed that most of the 30k posts were transferred, but post ownership was completely jumbled. Perhaps a fix to the post ownership issue could be to change user ids in Discourse B before export so that they don’t have a duplicate in Discourse A. Can this be done in bulk? Do i need to change usernames in B, and can it be done in bulk by adding “\_2” to each username? As for the 29,995 posts that didn’t make it over - I’m stumped. I see those topics scroll by during import, but not in Discourse A after import. --- _[View the full topic](https://meta.discourse.org/t/merging-two-discourse-forums/72578)._