Add Column will bring up the Column Definition window, where you can create a new column and define its parameters (name, value, formatting, etc.).
Edit Column will bring up the Column Information window, where you can edit the column parameters of a column selected in the Table Editor.
Close will close the Table Editor.
The Edit menu:
Clear will remove the selected contents. Similar to deleting the contents.
Select All Will select all contents for copying/pasting/clearing/etc.
Edit Header/Footer Will bring up the Header/Footer dialog, from which you can edit the contents of any header or footer you wish to add. For more, go here.
The Output menu:
Display in FlowJo Will create a FlowJo table that can be exported or added to a layout.
To Clipboard will open the Table Generation Options dialog for copying the contents of the table to your operating system's clipboard for pasting into another program or file.
To File will open the Table Generation Options dialog and prompt you to save as a CSV, Excel, HTML or other file type for export.
To Printer will bring up the print tab of the Table Generation Options dialog, from which you can set up your export to a designated printer.
All of these items will open the Table Generation dialog, with the destination set to the item selected from this menu.