Hello there!
I am wondering how to get mix it up with like filtering functionality with gallery in beaver builder.
Hey Ali,
Unfortunately, that’s not possible as of this time. We already have a feature request for that though on our User Voice. If you’ve a minute, feel free to vote for it below! 
https://wpbeaverbuilder.uservoice.com/forums/270594-general/suggestions/9670755-animated-and-most-importantly-a-filterable-pos
Ben