Adding to this statement in Badunit's solution:
"If the two tables are in different sheets, say Sheet A and Sheet B, the formula would be =Sheet A::Table 1::A2"
If each of the tables has a name that is distinct within the document, there is no need to include the Sheet name in the cell address in the formula.
Example: The Tale on Sheet A is named "Main" and the document contains no other Table with that name.
The table containing the formula is named 'Branch"
"Branch" may be on th same Sheet as "Main", or may be on another Sheet in the same document.
Formula in a cell on Branch: = Main::A2
Regards,
Barry