The "correlated variant" feature can be used to enable tracking mutations that are part of a subclade.
The G clade is the dominant form of the SARS COV-2 pandemic as of summer of 2020. It carries with it 4 nucleotide changes reactive to the Wuhan form: C241T, C3037T, C14408T, A23403G
Note: GISAID formally refers to an ancestral state of the G clade with just 3 base changes, as their definition of the G clade: C241T, C3037T, A23403G.
The change mutation at C14408 was part of the set of 4 mutations that were expanded together and now the now dominant G clade. A23403G encodes the D614G mutation.
The GR clade carries the G clade four base changes, plus a 3 contiguous base changes G28881A, G28882A and G28883C. The GR clade includes the S D614G mutation and the N G204R mutation.
The GH clade carries the G clade four base changes, plus the G25563T mutation. The GH clade includes the S D614G mutation and the NS3 (ORF3a) Q57H mutation.
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