Does reimporting users, threads and posts modify corrected forum permissions?

[محروم.كوم]

After the initial import from IPB we found that we need to do a lot of work on the permissions. Everything defaulted to all access. Can we begin to make those changes now, then do final imports of users, threads and posts from the live site without overwriting those changes? Otherwise we will be down for a significant period of time to make those changes after the final import from the live site. __DEFINE_LIKE_SHARE__