To add multiple rows, select Rows → Add Rows and specify the number of rows you want to add.
To add multiple columns, select Cols > Add New Column (Cols > Add Multiple Columns in JMP 12 and earlier) and specify the number of columns you want to add in the window that appears.
You can also perform the same operation by double-clicking the top left frame of the data table.
複数の列や行の追加