You can convert an E-margin trade into delivery only if you have adequate cash limits. You can also mark hold on additional funds from your linked bank account. Once the order is converted to delivery, your available limits will be reduced for further trading. 

Example: You buy 100 shares of INFOSYS at the rate of Rs. 500 under E-Margin. Limit utilized is say Rs. 10,000 against total order value of Rs. 50,000.

If you decide to take the delivery of 100 shares, you will have to mark a hold on additional funds of Rs. 40,000 (Rs.50, 000 - Rs. 10,000). Thus, your fund limits will decrease for further trading.