Allocating Rigs to certain Projects

It would be really handy to be able to allocate Rigs to certain Projects so when you have a dropdown of rigs to select only the rigs allocated to that Project show up and not our entire fleet. We are able to select what Projects people/users are in, it would be handy to be able to select only the rigs for that site/project not have to scroll through the entire rig fleet to find the rig thats at the site. Would be handy in the reporting too as not everyone knows what rig number is on what site