Is there any way to have people thats in a coaltion guild (3 guilds working together)
see the dkp points for the people that are in the other guilds?
And how do i save the list from raid to raid so i can use it week after week?

There is no current (easy) way to share data between guilds unfortunately. You could (in theory) have officers from the other guild have an alt in your guild, and vice versa, to merge data with as all data is shared across all characters. That's the only way I can think of at the moment that would allow you to do this.