read only selection grid remove rows that are selected

To remove the data from the read-only grid you need to remove it from the data the grid is using. Is your grid populated by a query, record type, or datasubset?

It is by record type, would the record type drop those records?

That really rather depends on your use case - what are you trying to have happen when you say "remove them from the grid"?  Usually this would imply that those rows in the database are removed/deactivated, but if it's something else for your case then clarification would be helpful.

Yes, there are two options: individually delete rows or create a complex action to delete multiple rows. If you want to delete individually you should create a related action to 'Delete' or 'Archive' a record, then you can easily add the record action to the grid. This will work when only one row is selected. To have a bulk delete function, you should create a process model to take in multiple IDs and delete them or archive them (archive is always better than deletion). You can add a button above the grid and use a!startProcess() to kick off your process model when multiple rows are selected and the button is pressed.

Yes, there are two options: individually delete rows or create a complex action to delete multiple rows. If you want to delete individually you should create a related action to 'Delete' or 'Archive' a record, then you can easily add the record action to the grid. This will work when only one row is selected. To have a bulk delete function, you should create a process model to take in multiple IDs and delete them or archive them (archive is always better than deletion). You can add a button above the grid and use a!startProcess() to kick off your process model when multiple rows are selected and the button is pressed.