Hi @sumadesign –
This isn’t a feature of WP Job Manager.
There is a third-party plugin that adds support for conditional fields:
I would recommend reaching out to the developer of that plugin to see if it can support your use case.
Otherwise, WP Job Manager is built to be extendable and you may be able to accomplish this with custom development work. However, we are unable to give specific advice on how to accomplish that.
Since this isn’t possible in the default WP Job Manager feature set, I am going to mark this thread as resolved. If you have additional questions about WP Job Manger in the future, feel free to open a new thread.