Multiple Userform - Transfer String Data

I am working with several userforms and try to transfer data obtained in one userform (lets call it Userform1) to another (Userform2).

Specifically, the idea is to have a commandboxA where the user can choose several options and the selection will define a string, and I want to use this string in Userform 2 to define a text.

Example:

The user chooses "solid" in the commandbox and I define the string as "rock"

Dim structure As String If commandboxA1.value = "solid" Then structure = "rock" etc...

And in Userform 2 I would like to combine the string structure with other strings, e.g.

If commandbox.value = "example" Then example text = "example text@ & structure & "text"

However this does not work, because the string which I have defined in Userform1 is not defined in Userform2. How would I define the string specifically, such that I have access to it in both userforms? How can I define the string as public? I tried several times, but could not get it to work.