If you have received the response from OpenAI you can use return value or change variable value actions and as the value you can bind to the result of a previous action
Before you can use the result from action 1 in action 2, you will need to test action 1 to get a result. Then, you will be able to access that result and use it in action 2.
Thank you Joyce, after following your link, i go to the solution via a similar doc.
For other users benefit, the solution was to:
Capture the OPENAI response from the workflow, by selecting the path in the ‘context’ next to the foruma, the path can be seen in the formula box,
and then assigning this to the ‘Change Value Variable’ . The examples online had "return a value’ step instead. which i’m not show how is used, anyway using the below it worked. Hope it helps: