To select a single row, click in a row to select it.

To select multiple sequential rows, click in the row of the first cost item you want to select, press and hold Shift, then click in the row on the last item in the continuous list of cost items you want to select.

To select multiple non-sequential rows, press and hold Ctrl, click in the row of the first cost item you want to select, click in the row of the next cost item you want to select, and continue selecting items until you have selected all the items.