Printing merged columns separatly ?

Hey everyone,

Need your help. I have a file with around 600 columns and 400 rows, and I want to print bloc of columns separatly, while keeping column A each time.

Here a sample of the file (fictionnal data) :

https://preview.redd.it/vtllx4bahrqg1.png?width=785&format=png&auto=webp&s=b7f2211598a7d1a43920ba07fe10a45f3a37ba20

I want to print column A with everything from USER A, then column A with everything from USER B... until the end of my table. The thing is, there is no "standard" columns number for each users. Some have only two columns, other 6.

I have around 180 users to print, so doing it manually will be a bit painful. Any idea ?

Thanks a lot for your help.