User interface > Transformation of groups of files > Transformation manager > Transformation options > N:N Transformation > Setting pattern for the target files
The names of the source files can be changed during the transformation in the transformation manager. They can be provided with a prefix, a postfix or a new extension. The pattern for the names of the target files is determined by the according fields.
Example:
changes the filenames in the following way
test.dat -> tt_test_01.tst
Source.txt -> tt_Source_01.tst