RANKX with IF and FILTER

[MichaelaMul]

Hi

I am trying to rank the products by volume share of segment if they belong in a specific Overall Product category. How would I add that filter to the DAX function below. 

Volume Share Rank = if(HASONEVALUE('Top 3 IRI'[Product]),RANKX(ALL('Top 3 IRI'[Product]),CALCULATE(sum('Top 3 IRI'[Volume Share of Segment]))),"--")

[Daniel29195]

@MichaelaMul 

can you please illustrate with some sample data of what you are tyring to achieve ? 

best regards