copy forum data

I need to have forum data copied; more specifically, posts. I need the data copied to another existing forum and I have an exact list of the posts and threads that need to be copied. The task requires accuracy and precision, as transferring the data is a delicate process and the threads and posts must be transferred accurately and precisely. Overall, I'm looking for assistance in transferring my posts and threads from one forum to another quickly and efficiently.
* *Has to be done manual, logins required, different skins prevent automation via numerous free GitHub projects already explored**
**Roughly 1700-2000 threads need to be copied**