When importing our clients database from our google sheet, only the first 20 columns were imported.
To solve this, I have tried to import the data in two phases so that I ended up with 2 groups.
After that, I needed to merge the 2 groups to reconstruct our database table. I was not able to find out how to do that if that even is possible. (This is similar to the operation JOIN in a relational database)
Note that the 2 groups have the same columns (I created the missing columns in each group and left them empty)