Update data from multiple rows in bulk

I create an editable grid where i can see the data of my CDT "Client" (red square) and the relationship or related data from CDT "Vendor" (blue square).

Now I want to select many rows to call a related or record  action to UPDATE the selected fields in the black square. (don't add more rows or delete, just UPDATE)

The data of the editable grid table comes from a form from another interface.

For example, in the image below, I select 3 rows, then for those 3 selected rows, then click a button or link to call a preconfigured related action to update the values in the black square.

The idea of this is to use the select to call a related record or action for bulk actions instead of making changes row by row.

Is it possible using a editable grid or a real only or is there another way to do the same?