How To Insert A object into Conext

Hi Techies,

I have 8 tables in my designer

and I have two contexts at designer level

And how to insert a object into a context that is not referencing any table.

For Example I have an object like "rownum" (Which should must be added at Universe level only not at report level). Here this object is not referencing any table and I want this to be used in a query where the remaining objects are coming from the context..

Thanks in Advance..