f you want to add the whole Custom post into the menu ( archive ) there are 2 ways:
- The clean way
Custom Post types have their own permalink - yoursite.com/taxonomy/custompost. So in the menu navigation you create your Custom Menu Item with a link to yoursite.com/taxonomy/After thats done you can customize the taxonomy with a template that sould be named as follows:
taxonomy-your-custom-post-type-name.php
and then you code it as you wish. - the developer friendly way
create a custom Page template and force the loop of custom posts like so: