function onOpen(event) {
    allMenu();
}

function allMenu(){
  var slideUi = SlidesApp.getUi();
  slideUi.createMenu('TEST SO')
      .addItem('Create Shape', 'createShape')
      .addToUi();
}

function onInstall(event) {
  onOpen(event);
}


function createShape() {

    let activePresentation = SlidesApp.getActivePresentation()
    let selection = activePresentation.getSelection()
    let pageElements = selection.getPageElementRange().getPageElements()

    //get table Left, table Top of each table under the pageElement object
    var tableLeft = pageElements[0].asTable().getLeft(),
        tableTop = pageElements[0].asTable().getTop();

    var cellTop = tableTop;
    var cellLeft = tableLeft;

    //get the row height and coloumn width, column width
    var rowHeight = pageElements[0].asTable().getRow(0).getMinimumHeight();
    var columnWidth = pageElements[0].asTable().getColumn(0).getWidth();

    //get the internal text of cell
    var cellText = pageElements[0].asTable().getCell(0, 0).getText().asString()

    var shape_t = selection.getCurrentPage().insertShape(SlidesApp.ShapeType.RECTANGLE, cellLeft+200, cellTop, columnWidth, rowHeight);
    shape_t.getText().setText(cellText);

}