Custom Data Colors using Function

Anonymous , Try to create a measure like 

Color =

Var _1 = [sum of BM Quantity] // make sure this the ratio measure 

Switch( true() ,

_1< =.25, "green",

_1< =.75, "yellow",

"Red"

)

Use in conditional formatting using field value option

How to do conditional formatting by measure and apply it on pie?: https://youtu.be/RqBb5eBf_I4

If this does not help
Can you share sample data and sample output in table format? Or a sample pbix after removing sensitive data.

Hi, Anonymous 

Here you should use 'value' instead of 'percent'. Percent in conditional formatting refers to the percentage of all data distributions. Please refer to this document for details.

You can also refer to my sample file：

Best Regards,
Community Support Team _ Eason