If have a list, for example of three elements, and put in each of this elements a pragraph. Then you can’t edit the paragraphs. It is only possible for the paragraph in the top list element, when you select the bold option of the paragraph. Crazy, but I found no other way to edit the paragraph.
I’m not sure I understand you correctly, but if you create one paragraph you could apply a custom class with the styling you want. Now duplicate that paragraph as many times as necessary and paste in new text, which will have the same styling applied automatically.