Save Page as Page layout or site template ?

HI

The Default.aspx page of Subsite 'ABC' is working fine (that has JS code to show status from list Onhover to specific div tag in default.aspx)

Now I wants all other subsite at same level should work and look like subsite ABC (4 OOB and 1 Custom webpart added on Page on different zone). which is best approach I should follow. please tell step by step details.

Thanks

Praveen