Macro

I am not quite sure how to accomplish this, but we have a document over 1000 pages, and need some of the information put onto one line.

EX:

This is some of the data and it goes on to another line.

I would like to take the second line and put it on the line above it, like in notepad where you can go as far to the right as you want.

The only problem is I only want this to happen until there is a

_____________________________________________

and then pick back up starting with the next line.

My guess is I could use If statements to make this work.

Any ideas?

Thanks in advance