Rip & Edit Out of Sync Audio for 4K UHD

[bird]

hi there,
i'm a newbie here, first post, sorry if these been asked before, tried search tool but didn't get the proper answers...

- i've 2 sources from the same movie
(A) 2160P 4K UHD Full Rip, OAR: 2.39:1 (with Dolby Atmos audio)
(B) 2160P MKV file, OAR IMAX 1.78:1 (with DD audio)

- what i want to do is to remux Dolby Atmos from (A) with (B) so finally i've got IMAX 1.78:1 movie with Dolby Atmos track

- i've been using DVDFab to create 4K UHD blu-ray disc from 2160P Remux MKV to play on Oppo 4K BD Player



3 QUESTIONS:

(1) HOW TO RIP ATMOS TRACK FROM 4K UHD FULL RIP?
how do i proper rip the Atmos track out of the (A) 4K UHD full rip? so i can remux it later on, and what's the audio file format is it supposed to be?

(2) HOW TO EDIT OUT OF SYNC?
now the thing is, (A) and (B) are slightly out of sync (source B being a little bit sooner) so how do i edit the Atmos track that i've got from (A) so it plays fine when i remux it with (B) or is there other way to work around this?

(3) ANY OTHER TOOL?
Besides DVDFab, are there any tools that can convert 2160P MKV file to be 4K UHD disc structure to play on 4K BD player?

hope my questions are not too confused lol
and thank you for everybody input in advance
cheers & take care
bird