Add files to a ListBox from a User defind folder

I am trying to create a user form that will list all the vendor folders, sub folders and files. I have already created a button that allows the user to pcik the vendor folder location, there is also a TextBox linked to the Browse button that shows the folder file path.
The problem I am having is getting the Mfg folders, sub folders and files listed in my ListBox.

What I am trying to do would look something like this

J:\Shared\Engineering\Electrical\Vendor Info <<<<Vendor folder path

Vendor Info <<<<Main folder
--------------AB <<<<Mfg folder
---------------------1492-IFM <<<<Sub folder
----------------------------1492-IFM20F_MULTIPLE.pdf <<<<File
--------------20-COMM-E Ethernet IP Adapter.pdf <<<<File
--------------ABB <<<<Mfg folder
---------------------Circuit Breakers <<<<Sub folder
----------------------------TMAX Series <<<<Sub folder
------------------------------------TMAX frames sizes 1-8.pdf <<<<File

This would be in "ListBox1" the user then could select the desired files click the move files to "ListBox2" button.
everyting in "listBox2" could then be copied out to a second user defind location once the user submits their file selection.

Here is what I have so far.
Vendor list.xlsm

I have been looking for an answer but have not been able to find anything.

Thank you for the help.

Attached is the part of your solution that populates the source listbox. [klonbeck=populate listbox with directory tree=Vendor list.xlsm] I added a button to bring the form up.

Note that I removed your scrollbars. A listbox has built-in scroll bars. I also set the ColumnWidths value to 1000 to force a horizontal scrollbar.

The list algorithm lists the folder name, then under it lists each subfolder and then the files. Under each subfolder, it lists those subfolders and then the files, and so on recursively.

You have a bit more work to do. I suggest using a second hidden column in the listbox to store the full path name of each file. You will have to figure out how to allow the user to only move files to the right side, and then how to actually perform the file move.