you can create multiple directories in the local host site. each sub directory will be far a specific site.
in other words, for my local MAMP server, the root is at /Applications/MAMP/htdocs/
I create a sub directory there for each site:
/Applications/MAMP/htdocs/site1/
/Applications/MAMP/htdocs/site2/
/Applications/MAMP/htdocs/site3/
this method allows you to have multiple sites hosted on your one local host