From the Options Chain, you can create a synthetic options spread as a user-defined strategy in the Strategy Creation widget. These spreads can be published to the market by the exchange and made available from trading in the current trading session.
To create a strategy in the Options Chain:
Click an options spread building button (e.g., Custom).
Tip: You can also press and hold the Ctrl key (control or command key for Mac OS) to enter spread building mode.

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Click an options Bid price to add a Buy leg or Ask price to add a Sell leg to the strategy.
Tip: Multiple clicks on a Bid/Ask price will increment the leg ratio of the strategy.

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Click Submit (or release the Ctrl key).
The Strategy Creation widget opens seeded with the options contracts, ratio, and Buy/Sell direction for each options leg.

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In the Strategy Creation widget, modify the strategy legs as needed (price, ratio, etc.) and click Create to submit your options strategy to the exchange.