You can place a SIP order to place buy orders for a certain amount and a certain quantity in the scrips of choice at regular intervals over a period as selected. You can place daily, weekly, fortnightly, or monthly SIP orders.
If you want to place a SIP order for individual stock, use Market Watch to search for a stock and hover your cursor. Select B to buy. From the top of the order window that opens up, access the drop-down menu at the top right corner. Select SIP order. Select frequency, quantity, date and time to place the order. Select Place SIP.