You can copy/paste cells in the Grid Widget. Cells are copied along with all of their content (including expression) and formatting. In order to copy cells, you can select a copy option from the toolbox or simply use CTRL+C. To paste the content, you should select a paste option from the toolbox or use CTRL+V.
When a cell is copied, a dashed border is added to the selection.
You can copy/paste a single cell or a multi-selection. If necessary, additional rows or columns are added to the grid, so that the whole content can be pasted.
You can copy a dynamic row/column along with their expression by selecting a whole row/column, then copy and paste it over another selected whole row/column.