Calculated field based on parent column

Hello Tableau community,

I am trying to create a calculated field

I would like to make the sub-total) a reference for my calculation (like when calculating a market share).

In the example attached, in the column "EI", The calculation I would like to do is:

1) ("growth of Meflosyl" * 100+100)/("growth of sub-total" * 100+100)

2) ("growth of Rimadyl INJ Cattle" * 100+100)/("growth of sub-total" * 100+100)

3) And so on for every product

In other words, I would like to make the total of the parent column as the divisor.

Do you think it is possible?

Thanks in advance and best regards,

Alex