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You cannot save different tabular distributions, however, you can open several different distributions at once. To do that, click the Open Copy In the Window button in the tabular distribution toolbar. The table will be shown in a separate window. After that you can select another element for distribution in the main window, modify the distribution and open it in another window.
You can also export distribution tables to CSV files. To do that, click the Export to CSV button in the tabular distribution toolbar.