We have found from our Web Development Department, that there is not a way in the Numbers program to convert a file to Text Tab Delimited. There is however, a way around it. We found the information below on a 'Mac Help Forum'.

1. Copy the Numbers Table.
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​2. Paste into Pages
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​3. In Pages, Format > Table > Convert Table to Text
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​4. Your new Pages file now can be Exported as Plain Text and will be Tab Delimited.

5. If your text file needs a particular extension, change it after exporting.

Updated: 4/4/2019