Hi Abdllah!
Thank you for reaching out with your question about BoldGrid Post and Page Builder for WordPress!
While you do have the ability to save blocks in Post and Page builder and reuse them in your content as you see fit, it is not completely possible to edit all blocks simultaneously after the block has already been placed.
You can modify the saved block and each time you place it there-after it will inherit the updated properties but you will still need to go back and update previously placed content.
I hope this helps. Please let us know if you have any other questions for us.