I have created new field on product section and I need to fill with some data.
Is there a way to run business rule that populate this field for all past records.
Unfortunately, it cannot be implemented by business rule, but it can be easily done by building a business-process.
I assume you will need only 2 elements - read data (past records) and modify data (change/add the value to the field). It can vary according to the logic you want to implement.
In case you want to add/divide or use any code you can use Script Task to accomplish your goal.
Here you can find guidelines on how to create a business-process in order to implement almost any business-idea you can imagine:
With best regards,