Custom Workflw using VS 2012 on sharepoint onlne (offce 365)

Question

Good Day

Requirement :

i am using vs 2012 to create custom workflow ( sharepoint.client.dll ) for sharepoint online

(Office 365 ) . i have created the sharepoint 2013 app project but as i try to add new Workflow i cannot ( even list as well Both )...

Problem:

as i add new item ( Workflow ) in project it gets connected to releavant site and it shows home page of my site ( releavant site which is mentioned in project URL ).

instead of this it should show me list to document libraries which we can attach with

please see the snap short for details

as i close this i get this image

Need urgent help ( Thanks in advance )