Nested rows in datatable

Hi everyone

I would like to create a table where rows are nested.

The idea is that I define a table called ‘Strategy’ which has in general 1 to 5 rows
and then by clicking a button I add the whole strategy table to one row of another table called Pricer

Each row of Pricer is a strategy (table of 1 to 5 rows) which can be deleted in one click

!

Here in the image uploaded the strategy is added to the pricer as an append with an end line called total

Any suggestions on how to implement this please? Or is it not doable to define a row as a table?