How to hide a show a list form?

Hi Guys,

I would just like to know if these are possible in SharePoint 2010 using SharePoint Designer 2010? Please advise.

1. Is it possible to show the inputted data of a list form into another list form? Data inputted on Custom List1 NewForm.aspx will be shown in Custom List2 NewForm.aspx as a table of information.
2. Can we hide a form after a certain event and show it later also after an event?
3. Is there a way to clear all items in a list?

Thank You,

Arnel