Reply with quote will quote an entire post. If I'm interested in replying to one line or one statement I will copy the line and paste it into my reply like this:

Code:
I guess I'll have to experiment
Then I will add opening and closing "quote" statements like this (the W was added to avoid technical difficulties):

Code:
[Wquote]I guess I'll have to experiment[/Wquote]
This is what the final result looks like once the W's are removed:
I guess I'll have to experiment