To understand the formation and evolution of the Milky-Way and other spiral galaxies, we need to find dynamical and chemical traces of past star-formation events. Chemical tagging of a very large sample of stars, using high resolution spectra with sufficiently detailed spectral line information, can provide this. The Galactic Archaeology with HERMES (GALAH) Survey was designed for this purpose by using high-resolution (R~28,000) spectra taken with the High Efficiency and Resolution Multi-Element Spectrograph (HERMES) instrument at the Anglo-Australian Telescope (AAT), with particular focus on the disk (De Silva et al. 2015).