Reading or storing parameter at URL level.

Hello All,

I need a help.

Is there any way in which i can store values passed in url in a parameter and use it later.

Why do i need this?

Problem Statement:

My user wants to have a dashboard which will contain

Level 1: Some image tiles (for example Project 1,Project 2,etc...), after clickling on any one image it should get redirect itself

to Level 2  which contains 

Level 2: categories (Now this categories are same for all the projects e.g Expernse, Quality, etc ) after clicking on any category button it should get redirect to Level 3

Level 3: Actual Reort with Slicer value (Slicer will contain Project 1 or Project 2 as its value, depending what user was selected)

How I achieved this is:

I created Dashboard with Project 1, Project 2, etc as image tiles. On clik of any one of them i set a custom external link of another dashboard which is categories dashboard and here on clickling any category i passed url to actual report.

The challenge which i am facing at Level 2 is how will i be able to know whether user has selected Project 1 or Project 2 or Project 3, as the categories will be same for all the projects and i want to keep only one categories dashboard.

So there any way that i can store values in a parameter and pass it furthur to any level.

Kindly help me in this,

Please suggest me any other better approach for doing this.