Selecting this option will pass any sub page paths seen on the initial Website URL onto the Redirect URL.
This option is useful when you need to redirect to the same page of another website where the initial website and the final redirect website have the same URL structure.
Your Website URL is http://mywebsite.com and you have set it up to redirect all Canadian visitors to http://mywebsite.ca
If a visitor arrived on your website directly onto a particular product e.g. http://mywebsite.com/shop/productA then 'shop/productA ' is the sub page path.
This path can be passed onto the final Redirect URL, so the visitor will get redirected to http://mywebsite.ca/shop/productA