hi Sumi.
in solution manager 7.1, you can create multiple Change document for One CR.
and in both 7.1 and 7.0, you can create multiple TR for one Normal changes ( earlier refered as normal correction) , but only one TR for urgent changes, to maintain prio of changes, the urgent changes (earlier refered as urgent correction) restrict to only 1 TR.
if you want multiple TR use Normal change.
Please check.
Thanks
Jansi