Is it bad to have multiple domains pointing to different pages on your website? For example - I have a directory( www.rummage4money.com ) and I also have a domain name emergencylight.com would it be a bad to point that domain to the lighting category of www.rummage4money.com?
As exam suggested set up a 301 redirect, which may either by creating domain aliases or modifying your htaccess file. Without this, the different domains will competiting against each other in the SERPs, plus they run the risk (as small as it is) of being banned due to duplicate content.