It is likely that as you are not including the actual filename, the published area has an .htaccess rule that is performing the resolution.

For sake of argument, let both pages are the end of the links have filename index.htm.

Root to sub-folder is simply TownGuide1/index.htm
Sub-folder to root is ../index.htm

You would still Export Website twice: for Itinerary.xar to sub-folder Itinerary; for TownGuide1.xar to sub-sub-folder (Itinerary)/TownGuide1.

For other, this is called relative addressing.

Acorn