USE TableFrom
COPY TO Temp.TXT SDF
USE TableTo
APPEND FROM Temp.TXT SDF
Otherwise, you will have to run through the first table and add them to the other table:
USE TableFrom IN 0
USE TableTo IN 0
SELECT TableFrom
SCAN
SELECT TableTo
APPEND BLANK
REPLACE TableTo.Field1 WITH TableFrom.Field1
REPLACE TableTo.Field2 WITH TableFrom.Field2
.
.
.
SELECT TableFrom
ENDSCAN