Dim variable named after a string's content

Hello !

Another weird question from me It may look simple but I have no clue how to do it :

In my VBA code, I gave a string the value "part1" & "part2". What I want to do now is creating another string that will be called "part1part2", but if I write

Dim TheString As String

it will not work, of course.

If anyone have an idea, I will be much grateful !

Thanks,

François