>>I'm trying to copy data(updated) from one table to another. Both have >>identical structures. I have been trying "copy/replace to array", and >>"replace/with" commands to no avail. I keep getting error messages usually >>that the alias cannot be found. Please help!


I am not sure what you are doing but you may want to try these ideas:
select file 1
goto top
scan
scatter memvar memo && use memo if you have memo fields
select file 2
gather memvar memo
select file1
endscan

Check out the help on scatter and gather

Another way is as follows:

select file1
append from file2

Costas