Refresh Info and from a query to intial query¡¡¡¡

Hello,

I'm trying to run a infrom but I got some problems to updated the data of the main data set.

So:

I got table 1 which is the main one

I got table 2

I merge both 1 and 2  and dependif of the info some cells will change an other remain.

The problem Is when I try to update the info that changed in the main dataset I'm been trying with customs but nothing.

(In SQL just you refenrece some colums and code UPDATE and that's all but power query not hahaha)

Sounds simple if you got a way to solve this would be appreciate it