First, you’ll want to start here (if you haven’t already):
(Notice the navigation on the right side of the screen to ‘advanced choicescript’ and other links)
About your first question: I’m not quite sure what you’re asking. It seems to me that your example is answering your own question (or I’m completely missing what your asking).
About the second, it’s:
*set inventory &", a roll of paper-money"
*set inventory old_inventory&", a roll of paper-money"
Be careful with this, as you can’t ‘redact’ the addition later. It might be better to handle it as a number of different true/false variables and only combine them when you’re going to display them. See how Choice of the Vampire handles languages here for an example: (http://www.choiceofgames.com/vampire/scenes/choicescript_stats.txt)
Third (a minor thing): If you put < code> before the first line of your code and < /code> after it, the forum will keep the indentation in place (it’ll appear as andymwhy’s did). Remember that proper indentation in choicescript is important.