How to add new entity in FILTER option?

[kavita21]

Hello Everyone,

I would like to add an additional Filter option.How is it done?

For example: At present i have 1)TITLE FILTER
2)AUTHOR FILTER
3)HITS FILTER

I want to add one more in the list.Which are the files to be modified and what is the path? Can someone help me ?

Thanks,
Kavita