How can I edit a Cell in MicroStation to have all instances of that Cell in my drawing to be updated dynamically?
in addition to Bob's reply, hope this link will help you >
https://communities.bentley.com/products/microstation/w/microstation__wiki/29169/update-replace-a-shared-cell-definition-with-original-cell-library
https://communities.bentley.com/products/microstation/w/microstation__wiki/2857/using-the-replace-cells-tool