Merging two Logs


Sorry but i can not find a answer to my question on Google and so on… so i try this way!

Is it possible to merge two logs from two diffrent raid days…? For example we clear Naxxramas on Thursday till Saphiron and then we kill the last two bosses on Sunday. How can i get my logs count as one log?

Is it possible with live loging or do i have to upload logs?

Would be nice if someone has an answer…