Software tds

We have purchased a software to ( Mr. X Co.) this year(A.y. 2012-13) which is mention below:

Software price                         300000.00

Add: Service Tax                      30900.00

Add: CST                                   6000.00

Total                                        336900.00

Please Explain us that can we deducted TDS against  this Invoice. If We deducted TDS then What Section Code  will be  applicable for this Amount which given above.

Also said that if TDS applicable then TDS Deducted  against Which amount for this case (Rs. 300000 or Rs. 336900)