When searching attribute element in a prompt, it is possible to use a string to search for specific element attributes using a string.
For example: To list only Miami, the string should have double quotes, like “Miami”. It is not case sensitive.
In order to list more than one specific element the string needs a semicolon to separate the elements, like “Miami” ; “New York”

Related Knowledge Base Article
KB38441: An explanation of all the wildcards and their uses within prompt searches in MicroStrategy Developer 9.4.x - 10.x
KB18469: How to obtain a specific attribute element from a large element list containing similar words within a string within a prompt in MicroStrategy Developer 10.x