SALV add 'super' columns per month

Dear Experts,

I'm looking for a way to group recurrent columns in a SALV table by month, that is to say, to add higher level columns representing months, and below the details of recurrent columns, like this:

to better explain, I've an internal table with data, per product, about quantity, price, cost and margin, for each month;

I would then need higher level columns with months (Jan, Feb, etc.), and under each of them, the details for the relevant month;

do you have any example or suggestion for me?

thank you very much for any help on this

with best regards,

JFlanders