I used to be able to do partial quotes easily, in reply to a post on the forums. NOTE THIS BUG ONLY HAPPENS IN IE 11, NOT CHROME:
Click the reply button of the post you wish to quote
The text of the message shows up in gray above your reply text box. Highlight A PORTION of it, then click the Quote hyperlink.
In Chrome, and of old, you got a quote of just what you highlight, In IE, you get everything and have to edit out the parts you don't want. This can be a challenge if the post had pictures and graphics in it!
Note, this is IE 11 on Win 7 x64.