After a server has undergone a build process and a MAC specific PXE config file has been placed in the TFTP directory with the contents of the Global PXE Localboot template, there is no way to force an update to the already built MAC specific config file, other than removing it from an environment and re-adding it.

A typical use case might be that you've built several hosts and the Global PXE Localboot template has been written to the MAC specific hosts, you then may want to update the Global PXE Localboot configuration file to add Memtest to the available boot options.

There should be a way to do this without moving the host around in environments.