Yes, you can place After market Orders (AMOs) in smallcase for the below set of order types. 

You can place the orders anytime after the market hours and the orders will be executed in the next market day between 9:00 AM and 9:14 AM (Pre market hours).  The orders will be executed at the current market prices. 

Once you place any order after the market hours, the order will be placed in pending status. So, you will also have the option to cancel the Placed order from the Orders page > Select the recent placed order > Cancel this order > Cancel Order:

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