Sure there is Don,
1) Copy the portion you want,
2) Reply to the post/thread that you want,
3) Click the "insert quote" button just above the post window where you normally write your reply,
4) Between the [quote} {/quote] brackets paste.
5) Done.

Also you can simple copy/paste what you want and add [quote} {/quote] before and after.
NOTE; { is replaced with [ and } replaced with ]

Todd.