Hi Ankit,
It depends where test script is stored. What is the type of the script Manual or Automated?
In case it is manual and stored in Excel or Word, you can consider using Word/Excel importer tool. Tool can be downloaded from extra section of download for RQM.

In case it is automation script (perl, batch, ANT, any custom automation type etc..), You will need to import it into RQM as remote script which will be the place holder for corresponding external script.
In case your script can run through command line, you can use generic Command line adapter of RQM. See Integrating with RQM using CLA

Any more info would be helpful if it does not answer ur question.

-|- Pramod Chandoria