Dynamic Sub-step in Guided Activity

Hi All,

My requirement is to add a dynamic sub-step in the roadmap of the guided activity when user clicks on a button on a particular view.

So, when user clicks on Add New button, a new step should be dynamically added to the guided activity and should show as 'a' in the roadmap.

This 'a' step should not be there in the beginning of the guided activity, it should come dynamically as shown below.

Thanks in advance.