You can use WordPress Reusable Blocks in Beaver Builder layouts. If a reusable block is updated in WordPress, it's also updated in any Beaver Builder layout where it's used.
Access Reusable Blocks
Launch Beaver Builder on your page or post.
Open the Content Panel and select the Reusable blocks subgroup.
Drag the block that you want to use into your layout.
Click the Done button and Save your changes.