Adding rows in DB without a CDT in 24.3

I have a read-only grid that pulls the data from record type . I am trying to enhance the feature to add an update link to the page to enter new rows and thats needs to be updated in the Table . 

Is there a way to achieve this without a CDT ?

                                                                                                                     (or)

Is there a way to update a table from the interface without a CDT?

  Discussion posts and replies are publicly visible

Parents Reply Children