Yes, this is possible. You can either use the approach demonstrated in this dedicated article:https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/data-editing/distinguish-edit-or-insert-mode
As demonstrated here:https://demos.telerik.com/aspnet-ajax/grid/examples/data-editing/form-template-update/defaultcs.aspx
Or just the if(e.Item is IGridInsertItem) statement as an alternative.
I hope this will prove helpful. Let me know if I can assist with anything else.