Method for deleting cell:
removeCell(int row, int column)
Method for deleting row:
removeRow(int row)
This is assuming that you are using widget extending HTMLTable (eg: Grid or FlexTable)
There isnt any "Title" to a table, what you are probably refering to is column headers in this case, you can apply styles to a given cell using:
getCellFormatter().setStyleName(
String styleName);
Via style you can highlight a cell by giving it background and making text bold so that it represents a header.