How and when you can use variables

Any time you see a red dollar sign by the side of a textbox, you may use a variable. Inside the textbox, you can mix variable names with static text, as you did in the last Job when you put the name of the new folder as ${Internal.Entry.Current.Directory}/${MY_FOLDER}.
To see all the available variables, both predefined and user-defined, you have to position the cursor in the textbox and press Ctrl + spacebar. A full list will be displayed, so you can select the variable of your choice. If you place the mouse cursor over any of the variables for a second, the actual value of the variable will be shown, as in the following screenshot:

Listing the available variables

If you know the name of the variable, you don't need to select it from the list. You may type its name by using either of these notations: ${<name>} or %%<name>%%.