Hi gt,
Yes.
In Numbers you can copy an existing Table and paste that copy elsewhere in the same document or in another document.
Pasting the Table into a separate document will sever all links to Tables left on the original document.
If the copy is Pasted to another Sheet in the document from which it was copied, formulas will likely retain their connections to the cells in other tables remaining in the same document.
You can also copy a Sheet in the source document. The copy will include the Sheet itself, and all of the contents of that sheet. These man include one or several Tables, Shapes or boxes containing text or images, charts (graphs) plotting bars or lines related to the data on one or more Tables, or images placed on the Sheet.
A copied Sheet can have its contents pasted to another Sheet in the same Document/Spreadsheet or onto a Sheet in another Spreadsheet Document.
Regards,
Barry