将QTableWidget的一部分复制到另一个

在@Kuba Ober的帮助下，这是我的解决方案：

//Model of my first QTableWidget
QItemSelectionModel *variableModel = ui->variableTableWidget->selectionModel();


//I take the cell selected in my QTableWidget ( I suppose only 1 cell is selected )
QModelIndex item;
QTableWidgetItem* itemCompleteTab = new QTableWidgetItem(); //You can't put a cell to another you have to use a new constructor
foreach (item, variableModel->selectedIndexes()) {
            itemCompleteTab->setText(ui->variableTableWidget->item(item.row(),item.column())->text());//Creation of my new cell
            ui->visualisationTableWidget->setItem(0,0,itemCompleteTab);//Add in the QTableWidget
        }