To the right of the Order Entry panel select Strategy Builder from the dropdown menu.
You will see the Option Chain window populate the screen. To the lower left, ensure that the Strategy Builder button is set to On. If you see Off, just click the button to activate.
To create a covered call, first the call option must be identified before the stock leg is added. When a single strike is clicked upon, the selected leg then populates the Strategy builder panel beneath the option chains window, where it can be manipulated before the order is submitted.
To include the underlying stock, expand the plus symbol in the Order Entry panel beneath. Locate Stock Leg and click on the field. The underlying is added to the Strategy Builder display beneath the short call option leg. Close the Advanced display in the Order Entry panel below by clicking the red x button.
Now the two pieces of the covered call are displayed and below the bid/ask column you will see the price quote for the combination. This is the price of the stock leg minus the premium received for the call option.
Use the Order Entry panel at the bottom of the page to create the order. Define the quantity of options to trade. Generally, one option contract covers 100 shares of stock. Click the Submit button to generate an Order Confirmation. When you have reviewed the details, click Transmit.
Source: (IBKR, 2023, PRACTICAL USAGE – BULL MARKET – COVERED CALL, https://ibkrcampus.com/trading-lessons/practical-usage-bull-market-covered-call/ )