Portia supports multiple annotations for the same attribute. We can extract an attribute to multiple fields by simply creating an annotation for each field. Imagine you want to extract the title "Quotes to scrape" and apply the annotation to every quotes in the website. (http://quotes.toscrape.com/)
To extract this information separately, you have to annotate the element, click the gear icon right after the ITEMS pane field name (title) and add annotation properties.
You can select elements with CSS selector by changing the selection mode of an annotation. You can do it clicking the symbol right to the annotation name in the ITEMS section of the left sidebar and source as "content". The information will be represented as below.