How to store the variable throughout the session?

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macros

VBA

MS-Word

I need to store variable value till the document closed. For example: Once I open a document, I should run the macro which will get variable value using "filedialog" option and that variable should be used by all other macros.
Code:

Sub Test_Macro()

Dim docTitle As Document
    Dim stylepath As String
Dim stylename As FileDialog
MsgBox ("Please choose Reference File")

Set stylename = Application.FileDialog(filedialogtype:=msoFileDialogFilePicker)
If stylename.Show Then
stylepath = stylename.SelectedItems(1)
End If

The stylepath variable should be used by other macros as well. After I opened the document I will set this variable by calling this macro function and later on that variable should be stored throughout the session and can be used by other functions as well.How to do it?
Thanks in advance.