How a create a variable in bot

I have a dialog which accepts a text input "9.1-Value", Which use to make an API call.

I the API gives me a false status. I ask for the same value from another dialog which will cal the same API. but now since the data from the API is coming from a different dialog box "10.1-Value". I have a create a new API in "API list" with same url but different body param (9.1 or 10.1). Is there any way I can create a variable and use that in API request body param.