For the purpose of copying the text, there is no automatic way to do it, but you can click and drag the first paragraph you want to copy, press CTRL, then click and drag the next paragraph you want to copy, etc. For it to work, you must hold the CTRL button the entire time, without letting go.
Because this is tedious, and because it’s so easy to let go by mistake and lose text you’d already copied, many people just copy one paragraph (or other block of text) at a time, and paste it into the target document, before returning to the source to copy more text. In other words, with a bit of practice, this might be a good solution for you, but don’t be discouraged if you waste some time figuring it out. You may even decide that it’s not worth the trouble. We’ve all been there.