Instructions
Open ATMA and select the "Utility" menu. Click "New Stash." Name the stash whatever you want. Save the stash. You now have a stash in which you can put items and gold from your characters in the game.
Open your saved "Diablo 2" character. Select and click "File." Load the .d2s file associated with your saved character. If you're not sure of the file that you're looking for, check your hard disk; usually, character files are located by default in the "C:\diablo2\save" directory.
Open your stash. Go to "File" and click on the .d2s file that you created for your stash.
Transfer gold by dragging it from the character and putting it into the stash. To give the gold to another character, open up a different character file, pull the gold from the stash and put it onto the second character.