TOP N excluding specific values

Hi Peter_Yaacoub ,

Please try to update the formula of the measure [] as below and check if it can return your expected result... You can find the details in the attachment.

Top 10 Growth % = 
VAR _selcompany =
    SELECTEDVALUE ( 'Companies'[Company] )
VAR _rank =
    RANKX (
        FILTER (
            ALLSELECTED ( 'Companies'[Company] ),
            NOT Companies[Company] IN { "Company A", "Company B" }
        ),
        [Net Sales Growth %]
    )
RETURN
    IF (
        NOT _selcompany
            IN { "Company A", "Company B" }
            && _rank <= 10,
        [Net Sales Growth %],
        BLANK ()
    )

If the above one can't help you, please provide some raw data in your table (exclude sensitive data) with Text format and your expected result with backend logic and special examples? It would be helpful to find out the solution. You can refer the following links to share the required info:

How to provide sample data in the Power BI Forum

How to Get Your Question Answered Quickly

And It is better if you can share a simplified pbix file. You can refer the following link to upload the file to the community. Thank you.

How to upload PBI in Community

Best Regards