Pass Workbook Variable Between Subs

This is the code after editing to make it more clear

Public Sub 1()
BookA= activeworkbook. name
BookB=Application.Workbooks.Add
Workbook(BookB).activate
End Sub

Public Sub 2()
BookB=Activeworkbook.name

With BookB. sheets(1)
.range("A1")=BookA.sheets(1).range("B1")
End Sub()

At the end of public sub 1, BookB is the active workbook. What I want to do in public sub 2 is to copy some data from BookA to BookB. Unfortunately, when moving from public sub 1 to public sub 2, BookA needs to be defined again. The code above is the code that I use in my add-ins. I figured out for non add-ins code I can define BookA with thisworkbook.name when BookB is active as I before work with BookA. This does not apply for add-ins as thisworkbook will refer to my add-ins code. Is there anyway of keeping definition of BookA is constant from one public sub to another public sub? This is simplified code. In fact, I can't merge public sub 2 with public sub 1 due to some reason which I don't say it here.