Bulk edits of map information has a “Copy Changes” feature. Select multiple rows, make a change to one row, and then click on “Copy Changes” to make the same change to all the selected rows.
For example, suppose we have a US map of locations in different states and we want to color all the markers in California to Yellow.
On your map, click on the Bulk Edits -> Markers menu item (this requires a paid subscription).
This opens up a new tab in the browser with an edit grid for all the locations on the map. Sort this grid using the “State” column, and select all rows from California. Change the “Marker” cell of one row to “Yellow” and hit “Copy Changes”. The change is propagated to all the selected rows. Pressing “Save Changes” will commit these changes.