|You need to give us some more information.|
It could be as simple using something like these formula in Sheet 1:
=Sheet2!A1 to see the data from a specific cell.
=VLOOKUP(A1,Sheet2!$B$1:$C$6,2,0) is you are looking something up in a table.
Please tell us what you are trying to do and we'll see how we can help.