[Suicide Junkie]

Ok, after you first run it, you'll want to load your files.

Click "Load components from file" and find your main_components.txt
This will give you a nice list of the things you can put in your stores.

Now hit the "Open Shops File" and find an existing main_stores.txt
This will fill in the first box with a list of the shops.
Click one of the shops, and the bottom box will fill with the shop categories.
Click one of the categories and press load.

The list of stuff for sale on the left will fill in.
You can drag and drop components in the list, from the list of components in the middle, or drop components in the trash can to get rid of them.
Insert Mode pushes the components out of the way to make room for the one you're dropping, and replace just sticks the new one in place of the old.

Once you are done, hit save.
If you want, you can change the Category name to make a new Category before hitting save, or even change the shop name in order to make a new shop for the Category and components you have on the left there.

Changes to the file are immediate when you hit the save button, and you must save before loading a new Category or you'll lose your changes.