Alternatively, If it is a single form that user needs to submit you can actually look into DWA which opens up the section to get user inputs and submit it. The main drawback of this is that DWA can only perform one interaction with the server, hence you can't have dynamic forms (post values or refresh sections) seeking user inputs. If you need a simple form for collecting some information from customer, please go with DWA.
Please go through the following article which talks about configuring DWA.
Thank you very much for your response, it was informative. I tried combining 2 activities, ShowSelectedportal and open Work. If I remove the portion of second activity of opening work from URL then Selected portal is getting opened. If I combine the second activity of Open work, then work object is getting opened in a screen without navigation panel of Portal. Please let me know if I am missing to check something.