Is the a way to create a custom filter for a page or the entity used by the page ?

For example Engineering is not Company or Site specific.  You can see all engineering parts related to all companies and sites.  We have a need to build a filter in based on the company the user belongs to.  Possible using something like the Standard Name Id to build the relationship.  

The challenge is how to create a custom filter on the entity or page.  Any suggestions would be appreciated.