By the previous post by me, I showed you how to create a custom Permission level.  Now I will show you how to assign this to users.

If the user is new, go to Site Actions >> Site Settings >> People and Groups.

Add a new user.

When you select a new user from your Active Directory, you should see a section where you can assign access.  Select “Give users permission directly”.  Then you can check any out-of-the-box or custom created permission levels.  For this purpose, select the one you created.

Click OK.  Now the user has been granted that access specifically.

You can also create a new group with this specific access. 

Go to the same area:  Site Actions >> Site Settings >> People and Groups.

Under the new dropdown, select New Group

Here you will have similar options you see elsewhere in MOSS.  You can name the group, give certain rights to viewing, and set permissions.

In the bottom section, select your custom Permission level you want for this group.

Click create and you now have a new group with the permission levels you set.  Add users to this group and you are finished.