Can a company make more than 1 announcement thread at the same time?
Only if it falls under the rule #12:12. No duplicate posting in multiple boards (except for re-posting it in the local language boards if it's translated).
This should be followed as well:
27. Using automated translation tools to post translated content in Local boards is not allowed.
If so, can both of them be active (meaning they are getting posts daily and both running like that)?
Yes (for those that were made within the above rules).I need to edit the existing one everytime i want to make some new announcement?
Yes, just edit the first post then make a new post (on that exact thread) to inform others.Can a company use multiple accounts to post multiple announcement threads?
No. 