Unhide row directly below

Hi,

I was wondering if it's possible to unhide a row directly below one that is visible?

I am creating a template for users that allows them to choose which lines (rows) they would like to use. They then hit a button to hide all the other lines they don't wish to use.

For each row that is visible I then need the row directly below it to become visible so that the user can enter associated information.

I'm stumped on how to do it. I have the user entering "a" in column A for any row they wish to keep - but I'm not sure how to incorporate this into unhiding the row below (or if I'm on the wrong track with my thinking).

Thanks for your help!

Jimbean