Search the Merchandise by filling in the desired Areas to be matched and select which Artists to get the information for. When the Search parameters have been set, simply 'Apply' the Search to show all the entries in the Merchandise that match the criteria.
Note that the Search uses partial matching so that you only need to put in part of a word to match. (eg. Searching for 'aust' in the Notes will result in all entries including 'Austria' and 'Australia')