Can I claim stock broker commissions for security transactions? where are stock broker subscription fees entered

As a rule, you can not directly claim a deduction for Stock Broker Commissions.

The commissions you paid to your broker to purchase your stocks are added to the cost of the investment. When you sell your stocks, the commission paid effectively reduces the proceeds of the sale. While you cannot deduct these commissions directly, the addition to cost and deduction from proceeds of sale will ultimately reduce the capital gain (or increase the capital loss) you claim.