I'm still a little confused by the description of your goal, but you should be able to accomplish this with dashboard actions (see Adding Actions to Dashboards | Tableau Software) and if you need more flexibility on the view contents, perhaps using two overlapping worksheets for (3). Depending on what is selected in the view you could show "3a" or "3b." See http://www.interworks.com/blogs/dwyers/2012/05/10/using-layout-containers-hide-views-your-tableau-dashboard and http://kb.tableausoftware.com/articles/knowledgebase/creating-sheet-selector-for-dashboard.
If you want additional help, it's much easier if you post a sample packaged workbook (.twbx) that illustrates the problem / goal. Then someone can walk you through the steps and you'll also have a working example.