The topic of making and managing annotations using DTPO in research and other workflows is probably one of the most frequent in the forum. Search on “annotation” alone turns up over 550 dialogs:
There’s also an extensive collection of user-contributed scripts, many of which can support exactly what you requested, here:
For example, I’ve found the greatest utility in the the annotation template + script provided and discussed in this thread
That template is just one of dozens posted by friendly researcher-scripters here.
It’s not necessary, however, to go so far as to install a custom annotation template, or even to use the Annotation template installed with DTPO. For example, if you have a PDF open in one DTPO window and an RTF open in another, then select the text you want to annotate (and, optionally, highlight it in the PDF) and then click-hold-drag-drop that text into the RTF, where it will be copied, and you can write your notes afterward.
There’s as many note-taking styles as there are researchers, I suppose 
I suggest browsing the forum more because you’ll find more and better advice than the above - enough to give you an excuse to stay aware from the library if you need a break 
BTW, yes, I’d take DTPO on my laptop to the library or wherever I’m doing research and do my note taking right into DTPO.