You can create an editable column and use 'categorical' function to add dropdown list as per your requirement.
Kindly follow this MATLAB answer for a similar example where a dropdown is created using 'categorical' function.
For the second part you can create correcsponding edit fields from the component library and append the data to the table.
function UpdateButtonPushed(app, event)
app.Data=app.UITable.Data;
app.Data=[app.Data;{app.PropertyEditField.Value,app.timeEditField.Value,app.DropDown.Value,1,1}]
app.UITable.Data=app.Data;
app.UITable.ColumnEditable=true;
end
