The new quoting function makes it very simple to quote to multiple posts in a thread in one reply.

To quote multiple posts in a thread:

click the + icon entitled "multi quote" in the far left corner of the post.  Do this for each post you wish to include.

When you have multiple posts selected you will see a pop up in the bottom right hand corner of your screen "multi posts" click this and it will bring up a reply with all selected posts quoted.

Reply as normal.  (Please remember to snip the extraneous texts to keep things tidy. 

To quote one post:

This is the same procedure as before:  Click "quote" on the post and reply. Alternatively, you can highlight the specific section of text that you want to quote and click "quote selection".